774 research outputs found
Reaction of phenylchlorocarbene in oxygen-doped matrices
No full textPT: J; CR: ANDREWS L, 1972, J PHYS CHEM-US, V76, P3208 BAILEY PS, 1978, OZONATION ORGANIC CH, V1 CASAL HL, 1984, J AM CHEM SOC, V106, P7623 CASAL HL, 1985, J AM CHEM SOC, V107, P4616 CHAPMAN OL, COMMUNICATION CHAPMAN OL, 1979, J AM CHEM SOC, V101, P3690 CHAPMAN OL, 1984, J AM CHEM SOC, V106, P1842 COX DP, 1983, TETRAHEDRON LETT, V24, P5313 DUNKIN IR, 1983, J CHEM SOC CHEM COMM, P1213 DUNKIN IR, 1985, TETRAHEDRON, V41, P339 DUNKIN, 1986, J CHEM SOC CHEM COMM, P154 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 GRILLER D, 1982, J AM CHEM SOC, V104, P5549 GRILLER D, 1983, J ORG CHEM, V48, P1359 HARDING LB, 1978, J AM CHEM SOC, V100, P7180 HIGLEY DP, 1974, J AM CHEM SOC, V96, P3330 HOUK KN, 1984, J AM CHEM SOC, V106, P4291 HOUK KN, 1984, J AM CHEM SOC, V106, P4293 HOUK KN, 1985, TETRAHEDRON, V41, P1555 JEYARAMAN R, 1984, J AM CHEM SOC, V106, P2462 KESSELMAYER MA, 1986, J AM CHEM SOC, V108, P99 LIU MTH, UNPUB MOSS RA, 1983, TETRAHEDRON LETT, V24, P685 MURRAY RW, 1971, J AM CHEM SOC, V93, P4963 MURRAY RW, 1973, J AM CHEM SOC, V95, P3343 MURRAY RW, 1985, J ORG CHEM, V50, P2847 REGITZ M, 1978, CHEM DIAZONIUM DIA 2, P696 RULE M, 1982, J AM CHEM SOC, V104, P2209 SHERIDAN RS, 1984, J AM CHEM SOC, V106, P436 SUGAWARA T, 1983, CHEM LETT, P1261 TALBOTT RL, 1972, 3632606, US TURRO NJ, 1980, J AM CHEM SOC, V102, P7576 TURRO NJ, 1982, J AM CHEM SOC, V104, P1754 VARSANYI G, 1974, ASSIGNMENTS VIBRATIO, V1 WADT WR, 1975, J AM CHEM SOC, V97, P3004; NR: 35; TC: 99; J9: J AMER CHEM SOC; PG: 4; GA: A7574Source type: Electronic(1
Thermolysis and photolysis of 3-chloro-3-benzyldiazirines in alkenes; evidence for a carbene-alkene complex
No full textPT: J; CR: DOLBY LJ, 1966, J ORG CHEM, V31, P110 FRENKING G, 1984, TETRAHEDRON, V40, P2123 GIESE B, 1982, ANGEW CHEM INT EDIT, V21, P310 GOULD IR, 1985, TETRAHEDRON, V41, P1587 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 HOUK KN, 1984, J AM CHEM SOC, V106, P4291 HOUK KN, 1984, J AM CHEM SOC, V106, P4293 HOUK KN, 1985, TETRAHEDRON, V41, P1555 LEHR NJ, 1982, J AM CHEM SOC, V104, P1754 LIU MTH, 1985, J CHEM SOC CHEM COMM, P982 LIU MTH, 1985, TETRAHEDRON LETT, V26, P3071 LIU MTH, 1986, J CHEM SOC PERK T 2, P1233 LIU MTH, 1987, CHEM DIAZIRINES, CH5 MARCH J, 1985, ADV ORG CHEM, P244 MOSS RA, 1986, J AM CHEM SOC, V108, P7028 SCHAEFER HF, 1979, ACCOUNTS CHEM RES, V12, P288 SOUNDARARAJAN N, UNPUB TOMIOKA H, 1984, J AM CHEM SOC, V106, P454 TOMIOKA H, 1984, J CHEM SOC CHEM COMM, P476; NR: 19; TC: 28; J9: J ORG CHEM; PG: 5; GA: K1778Source type: Electronic(1
Benzylchlorocarbene: UV absorption spectrum, kinetics for 1,2-H migration and mechanism for reaction with acetic acid as determined by combined continuous and laser-flash photolysis
No full textPT: J; CR: BURFIELD DR, 1981, J ORG CHEM, V46, P629 GOULD IR, 1985, ETRAHEDRON, V41, P1987 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 HOUK KN, 1984, J AM CHEM SOC, V106, P4291 HOUK KN, 1984, J AM CHEM SOC, V106, P4293 LIAU MTH, 1987, CHEM DIAZIRINES LIU MTH, UNPUB J AM CHEM SOC LIU MTH, 1984, TETRAHEDRON, V40, P887 LIU MTH, 1989, J CHEM SOC CHEM COMM, V12 MAERCKER A, 1982, CHEM BER, V115, P540 MOSS RA, 1986, J AM CHEM SOC, V108, P7028; NR: 11; TC: 5; J9: LASER CHEM; PG: 9; GA: ED999Source type: Electronic(1
Disorders of sex development
No full textFil: Rey, Rodolfo Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Centro de Investigaciones Endocrinológicas "Dr. César Bergada". Gobierno de la Ciudad de Buenos Aires. Centro de Investigaciones Endocrinológicas "Dr. César Bergada". Fundación de Endocrinología Infantil. Centro de Investigaciones Endocrinológicas "Dr. César Bergada"; ArgentinaFil: Houk, Christopher P.. No especifíca;Fil: Witchel, Selma. No especifíca;Fil: Lee, Peter A.. No especifíca
Theoretical study of a termolecular mechanism for the reaction of (trimethylsilyl)thiazole with carbonyl compounds
No full textThe mechanism of the addition of 2-silylthiazole to formaldehyde has been studied by ab initio calculations at the MP2/6-31+G*//6-31G* level. The reaction is predicted to occur by the concerted formation of an N-[(silyloxy)methyl]thiazolium-2-ylide intermediate followed by nucleophilic addition of the intermediate to another formaldehyde molecule. Loss of the first formaldehyde gives the addition product. An alternative mechanism involving 1,2-migration of the ylide to form 2-[(silyloxy)-methyl]thiazole is prevented because of the high activation energy of the 1,2-shift. A third mechanistic alternative involving the formation of an N-silylthiazolium-2-ylide through 1,2-silyl migration is also discounted due to a high activation energy
Facile formation of azines from reactions of singlet methylene and dimethylcarbene with precursor diazirines
No full textThe reactions of the singlet methylene (la) and dimethylcarbene (1b), with their diazirine precursors, diazirine (2a), and dimethyldiazirine (2b), have been studied theoretically using ab initio and density functional theory. The reaction has no activation barriers for the parent system (la + 2a) and proceeds via a reactive complex and a transition state with a small negative enthalpy of activation (Delta H-298(not equal) = -1.1 kcal mol(-1), Delta S-298(not equal) = -34.4 cal mol(-1) K-1 Delta G(298)(o) = 9.2 kcal mol(-1)) for the dimethyl derivatives (1b + 2b). The formation of N-methylene diazirinium ylides (3a,b) is exothermic by 64-80 kcal mol(-1). The isomer, 1,3-diazabicyclo[1.1.0]butane (4a), is more stable (5-12 kcal mol(-1)) than isomer 3a, but can neither be formed by direct thermal reaction of 1a with 2a nor undergo the direct rearrangement into formaldazine (5a). The rearrangement of ylides 3a,b into azines 5a,b proceeds by conrotatory C-3(-) N-1 ring opening. The predicted activation barrier of ca. 15 kcal mol(-1) for the ring opening in ylide 3b is in excellent agreement with experimental data. The formation of pyridinium ylides from carbenes and pyridine is also studied.PT: J; CR: BONNEAU R, 1992, J PHOTOCH PHOTOBIO A, V68, P97 BONNEAU R, 1998, J PHOTOCH PHOTOBIO A, V116, P9 BRINTON RK, 1955, J AM CHEM SOC, V77, P842 CURTISS LA, 1991, J CHEM PHYS, V94, P7221 DIX EJ, 1994, THESIS U ROCHESTER N DOYLE MP, 1987, CHEM DIAZIRINES, V2, P33 DOYLE MP, 1987, J ORG CHEM, V52, P1619 FREY HM, 1963, J CHEM SOC, P3514 FRISCH MJ, 1995, GAUSSIAN 94 REVISION GONZALEZ C, 1990, J PHYS CHEM-US, V94, P5523 GRAHAM WH, 1962, J AM CHEM SOC, V84, P1063 HORNE DG, 1970, P ROY SOC A, V315, P301 HOUK KN, 1984, J AM CHEM SOC, V106, P4293 JACKSON JE, 1994, ADV CARBENE CHEM, V1, P8 LIU MTH, 1987, CHEM DIAZIRINES, V1, P112 LIU MTH, 1992, J PHOTOCH PHOTOBIO A, V63, P115 LIU MTH, 1994, RES CHEM INTERMEDIAT, V20, P195 MCQUARRIE DA, 1973, STAT THERMODYNAMICS MORGAN S, 1991, J AM CHEM SOC, V113, P2782 MOSS RA, 1990, J AM CHEM SOC, V112, P5642 MOSS RA, 1994, ADV CARBENE CHEM, V1, P59 MOSS RA, 1997, J AM CHEM SOC COMM, P617 OGILVIE JF, 1968, J CHEM PHYS, V48, P2248 OGILVIE JFJ, 1965, J CHEM SOC CHEM COMM, P359 REED AE, 1988, CHEM REV, V88, P899 WEINHOLD F, 1988, STRUCTURE SMALL MOL ZVEREV VV, 1973, J GEN CHEM USSR, V43, P2005; NR: 27; TC: 8; J9: CAN J CHEM; PG: 10; GA: 219NDSource type: Electronic(1
Photo 24: Fireplace Tongs
No full textThese fireplace tongs were discovered on November 17, 1982 by the Vargos, the current owners of the home occupied by the Sheppards\u27 neighbors, J. Spencer Houk and Esther Houk in 1954. The Bay Village Police sent the tongs to the Coroner\u27s office for testing. See Vargo, Paul G., Police Statement
In the 1960s, F. Lee Bailey had theorized that J. Spencer Houk and Esther Houk murdered Marilyn Sheppard.https://engagedscholarship.csuohio.edu/coroner_photos_1954/1025/thumbnail.jp
Photo 25: Fireplace Tongs
No full textThese fireplace tongs were discovered on November 17, 1982 by the Vargos, the current owners of the home occupied by the Sheppards\u27 neighbors, J. Spencer Houk and Esther Houk in 1954. The Bay Village Police sent the tongs to the Coroner\u27s office for testing. See Vargo, Paul G., Police Statement
In the 1960s, F. Lee Bailey had theorized that J. Spencer Houk and Esther Houk murdered Marilyn Sheppard.https://engagedscholarship.csuohio.edu/coroner_photos_1954/1026/thumbnail.jp
Photo 24: Fireplace Tongs
No full textThese fireplace tongs were discovered on November 17, 1982 by the Vargos, the current owners of the home occupied by the Sheppards\u27 neighbors, J. Spencer Houk and Esther Houk in 1954. The Bay Village Police sent the tongs to the Coroner\u27s office for testing. See Vargo, Paul G., Police Statement
In the 1960s, F. Lee Bailey had theorized that J. Spencer Houk and Esther Houk murdered Marilyn Sheppard.https://engagedscholarship.csuohio.edu/coroner_photos_1954/1025/thumbnail.jp
Activation parameters for the reaction of phenylchloro carbene with pyridine, tri- n -butyltin hydride, and triethylsilane; evidence against the need to invoke reversibly formed complexes in the reaction of this carbene with olefins
No full textPT: J; CR: CALDIN EF, 1964, FAST REACTIONS SOLUT, CH1 DOYLE MP, UNPUB TETRAHEDRON LE GIESE B, 1978, ANGEW CHEM INT EDIT, V17, P595 GIESE B, 1980, ANGEW CHEM INT EDIT, V19, P835 GIESE B, 1980, LIEBIGS ANN CHEM, P725 GIESE B, 1981, CHEM BER, V114, P3306 GIESE B, 1982, ANGEW CHEM INT EDIT, V21, P310 GOULD IR, 1985, TETRAHEDRON, V41, P1587 HOUK KN, 1984, J AM CHEM SOC, V106, P4291 HOUK KN, 1984, J AM CHEM SOC, V106, P4293 HOUK KN, 1985, TETRAHEDRON, V41, P1555 JACKSON JE, 1988, IN PRESS J AM CHEM S, V110 MOSS RA, 1986, J AM CHEM SOC, V108, P7028 PLATZ MS, 1983, TETRAHEDRON LETT, V24, P4763 SCAIANO JC, 1988, CHEM KINETICS SMALL, P73 SKELL PS, 1969, J AM CHEM SOC, V91, P7131 SOUNDARARAJAN N, 1988, IN PRESS J AM CHEM S, V110 TURRO NJ, 1987, J AM CHEM SOC, V109, P4973 WEAST RC, 1970, HDB CHEM PHYSICS, F42 ZUGRAVESCU I, 1976, N YLID CHEM; NR: 20; TC: 36; J9: TETRAHEDRON LETT; PG: 4; GA: T9526Source type: Electronic(1
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