414,090 research outputs found
Energy barrier for 1,2-chlorine migration in α-methyl-αlpha-chlorobenzyl(chloro)carbene
No full textPT: J; CR: BONNEAU R, 1989, J AM CHEM SOC, V111, P5973 BONNEAU R, 1989, J PHYS CHEM-US, V93, P4802 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 LIU MT, UNPUB LIU MTH, 1985, J CHEM SOC CHEM COMM, P982 LIU MTH, 1990, J AM CHEM SOC, V112, P3915 PLATZ MS, 1989, J AM CHEM SOC, V111, P6874 WARNER PM, 1984, TETRAHEDRON LETT, P4211; NR: 8; TC: 5; J9: J CHEM SOC CHEM COMMUN; PG: 3; GA: EL425Source type: Electronic(1
Transformation of phenylchlorodiazirines to 1,3-dioxolanes and a 1,3-dithiolane
No full textPT: J; CR: FREIDRICH K, 1985, TETRAHEDRON LETT, V26, P193 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 INDICTOR N, 1969, J CHEM ENG DATA, V14, P76 KIRMSE W, 1971, CARBENE CHEM KIRMSE W, 1981, J AM CHEM SOC, V103, P5935 LIU MTH, 1972, CAN J CHEM, V50, P3009 LIU MTH, 1984, J CHEM SOC CHEM COMM, P1062 LIU MTH, 1984, TETRAHEDRON, V40, P887 MOSS RA, 1973, CARBENES, V1 MOSS RA, 1975, CARBENES, V2 MOSS RA, 1984, TETRAHEDRON LETT, V25, P1023 STEINBECK K, 1979, CHEM BER, V112, P2402 WARNER P, 1984, J ORG CHEM, V49, P3666; NR: 15; TC: 0; J9: HETEROCYCLES; PG: 5; GA: AVW79Source type: Electronic(1
Activation energy for a 1, 2-hydrogen shift in (phenoxymethyl) chlorocarbene
No full textPT: J; CR: BONNEAU R, 1989, J AM CHEM SOC, V111, P5973 EVANSECK JD, 1990, J PHYS CHEM-US, V94, P5518 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 JACKSON JE, 1988, J AM CHEM SOC, V110, P5595 JACKSON JE, 1989, J AM CHEM SOC, V111, P6874 LAVILLA JA, 1989, J AM CHEM SOC, V111, P6877 LIU MTH, 1987, CHEM DIAZIRINES, V1, P111 LIU MTH, 1989, J AM CHEM SOC, V111, P6873 LIU MTH, 1990, J AM CHEM SOC, V112, P3915 MORGAN S, 1991, J AM CHEM SOC, V113, P2782 MOSS RA, 1990, J AM CHEM SOC, V112, P5642 MOSS RA, 1990, KINETIC SPECTROSCOPY SCAIANO JC, 1988, CHEM KINETICS SMALL, V3, P73; NR: 13; TC: 5; J9: J ORG CHEM; PG: 2; GA: GH369Source type: Electronic(1
Absolute rate constant for the reaction of benzylchlorocarbene with hydrogen chloride
No full textThe rate constant for the reaction of benzylchlorocarbene with HCl is 4.7 x 10(9) dm3 mol-1 s-1.PT: J; CR: BONNEAU R, 1989, J AM CHEM SOC, V111, P5973 BONNEAU R, 1990, LASER CHEM, V10, P267 JACKSON JE, 1988, J AM CHEM SOC, V110, P5595 JACKSON JE, 1989, J AM CHEM SOC, V111, P6874 LIU MTH, 1985, J ORG CHEM, V50, P3218 LIU MTH, 1989, J PHYS CHEM-US, V93, P7298 LIU MTH, 1990, J AM CHEM SOC, V112, P3915 MOSS RA, 1990, J AM CHEM SOC, V112, P5642 MOSS RA, 1990, TETRAHEDRON LETT, P1225; NR: 9; TC: 1; J9: J CHEM SOC CHEM COMMUN; PG: 2; GA: GP557Source type: Electronic(1
Kinetic and spectroscopic properties of carbene-diazirine ylides
No full textThe formation of a metastable carbene-diazirine ylide (CDY), characterized by an UV absorption spectrum in the range of 270-290 nm and yielding azine by rearrangement, is shown to be a general process in the photolysis of diazirines. However, the yield of formation and the lifetime of CDY greatly depend on the system considered. The decreasing value of the rate constant of the reaction, carbene + diazirine --> CDY, from similar to 10(9) M-1 s(-1) for singlet dialkylcarbenes, Ad: (adamantylidene) and BCN: (bicyclo[3.3.1]non-9-ylidene), to similar to 10(8) M-1 s(-1) for benzylchlorocarbene and to similar to 10(6) M-1 s(-1) for cyclopropyl and phenylchlorocarbenes, reflects the decreasing reactivity of these carbenes. The lifetime of these ylides is determined by the value of the activation energy barrier for their rearrangement to azine, E-a approximate to 15.5 kcal/mol for dialkylcarbenes, approximate to 11.5 kcal/mol fur alkylchlorocarbenes, and <10 kcal/mol for phenylchlorocarbene. This decrease of E-a is related to the strong stabilization of the azine when proceeding from CR2=N-N=CR2 to Ph-CCl=N-N=CCl-Ph. Another mechanism for the formation of azine, by a second-order reaction of the diazo isomer of the diazirine, is clearly identified in the case of photolysis of the BCN(N-2) diazirine.PT: J; CR: BONNEAU R, 1989, J AM CHEM SOC, V111, P5974 BONNEAU R, 1992, J PHOTOCH PHOTOBIO A, V68, P97 BONNEAU R, 1997, PURE APPL CHEM, V69, P979 BONNEAU R, 1998, J PHOTOCH PHOTOBIO A, V116, P9 BRINKER UH, 1998, ADV CARBENE CHEM, V2 DOYLE MP, 1987, J ORG CHEM, V52, P1619 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 JACKSON JE, 1988, J AM CHEM SOC, V110, P5595 LIU MTH, 1992, J AM CHEM SOC, V114, P3604 LIU MTH, 1992, J ORG CHEM, V57, P2483 LIU MTH, 1992, J PHOTOCH PHOTOBIO A, V63, P115 LIU MTH, 1994, INT J CHEM KINET, V26, P1179 LIU MTH, 1994, J PHOTOCH PHOTOBIO A, V84, P133 LIU MTH, 1994, RES CHEM INTERMEDIAT, V20, P195 LIUEAU R, 1989, J PHYS CHEM-US, V93, P7300 MERRER DC, 1998, J ORG CHEM, V63, P3010 MOSS RA, 1990, J AM CHEM SOC, V112, P1638 MOSS RA, 1990, J AM CHEM SOC, V112, P5642 OIDA S, 1967, CHEM PHARM BULL, V15, P545 OIDA S, 1968, CHEM PHARM BULL, V16, P654 SHUSTOV GV, 1999, CAN J CHEM, V77, P540 TURRO NJ, 1980, J AM CHEM SOC, V102, P7576; NR: 22; TC: 8; J9: J PHYS CHEM A; PG: 6; GA: 311EYSource type: Electronic(1
Self quenching reaction of (Phenoxymethyl) chlorocarbene with diazirine
No full textThe combination of laser flash photolysis and product analysis demonstrates that even though (phenoxymethyl)chlorocarbene reacts with its diazirine precursor with a substantial rate constant of 3.5 x 10(8) M(-1)s(-1), the predicted azine product is not formed. These results indicate either carbene/diazirine reversibility or subsequent hydrogen migration of the carbene/diazirine adduct. Also, a rate constant of 2.0 x 10(7) s(-1) for the 12-hydrogen atom migration in (p-nitrophenoxymethyl)chlorocarbene has been determined using the pyridinium ylide technique.PT: J; CR: CHATEAUNEUF JE, 1991, J ORG CHEM, V56, P5942 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 LIU MTH, 1992, J AM CHEM SOC, V114, P3604 LIU MTH, 1992, J PHOTOCH PHOTOBIO A, V63, P115 MORGAN S, 1991, J AM CHEM SOC, V113, P2782 MOSS RA, 1990, J AM CHEM SOC, V112, P5642 MOSS RA, 1990, KINETICS SPECTROSCOP; NR: 7; TC: 6; J9: RES CHEM INTERMEDIATES; PG: 5; GA: ND525Source type: Electronic(1
Time-resolved Systems Immunology Reveals a Late Juncture Linked to Fatal COVID-19. Liu et al
No full textSupplemental Tables 1-7 for the paper: Can Liu, Andrew J. Martins, William W. Lau, Nicholas Rachmaninoff, ..., John S. Tsang. (2021). "Time-resolved Systems Immunology Reveals a Late Juncture Linked to Fatal COVID-19." Cell. In Press
Direct measurement of the energy barrier for 1,2-chlorine atom migration in α-methyl-α-chlorobenzyl (Chloro) crbene
No full textThe first direct determination of a 1,2-chlorine atom shift in a chlorobenzylcarbene was achieved by nanosecond laser flash photolysis. Arrhenius activation parameters of E(act) = 3.39 +/- 0.14 kcal mol-1 and log [A(s-1)] = 10.98 +/- 0.14 were obtained for 1,2-chlorine migration in alpha-methyl-alpha-chlorobenzyl(chloro)carbene. The lifetime of this carbene is considerably longer than previously estimated and the measured E(act) is in excellent agreement with that determined by product analysis.PT: J; CR: BIRD CL, 1967, J CHEM SOC CHEM COMM, P7 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 LAVILLA JA, 1989, J AM CHEM SOC, V111, P6877 LIU MTH, 1989, J PHYS CHEM-US, V93, P7298 LIU MTH, 1990, J AM CHEM SOC, V112, P3915 LIU MTH, 1990, J CHEM SOC CHEM COMM, P1650 NAGARAJAN V, 1985, J PHYS CHEM-US, V89, P2330 TURRO NJ, 1982, J AM CHEM SOC, V104, P1754; NR: 8; TC: 2; J9: J PHYS ORG CHEM; PG: 2; GA: HX201Source type: Electronic(1
Carbonyl ylide from 3-chloro-3-p-nitrophenylcarbene and acetone
No full textPT: J; CR: BEKHAZI M, 1983, J AM CHEM SOC, V105, P1289 DEMARCH P, 1982, J AM CHEM SOC, V104, P4952 DEMARCH P, 1982, J AM CHEM SOC, V104, P4953 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 GRILLER D, UNPUB HUAN Z, 1983, TETRAHEDRON LETT, V24, P2829 LIU MTH, 1972, CAN J CHEM, V50, P3009 LIU MTH, 1982, CHEM SOC REV, V11, P127 MARTIN CW, 1983, J ORG CHEM, V48, P1898 TAKEBAYASHI M, 1970, B CHEM SOC JPN, V43, P1500 UEDA K, 1972, B CHEM SOC JPN, V45, P2779; NR: 11; TC: 22; J9: TETRAHEDRON LETT; PG: 4; GA: D9916Source type: Electronic(1
The thermal decomposition of diazirines: 3-(3-methyldiazirin-3-yl)propan-1-ol and 3-(3-methyldiazirin-3-yl)propanoic acid
No full textPT: J; CR: BIGOT B, 1978, J AM CHEM SOC, V100, P6575 BRIDGE MR, 1969, J CHEM SOC A, P91 CHURCH RFR, 1970, J ORG CHEM, V35, P2465 CLOSS GL, 1965, J AM CHEM SOC, V87, P4270 EFFIO A, 1980, J AM CHEM SOC, V102, P1734 FIGUERA JM, 1976, AN QUIM, V72, P737 FIGUERA JM, 1978, J CHEM SOC F1, V74, P809 FIGUERA JM, 1979, J PHOTOCHEM, V10, P473 FREY HM, 1963, J CHEM SOC, P3514 FREY HM, 1964, J CHEM SOC, P4700 FREY HM, 1965, J CHEM SOC, P1700 FREY HM, 1965, J CHEM SOC, P3101 FREY HM, 1966, J CHEM SOC A, P968 FREY HM, 1977, J CHEM SOC F1, V73, P2010 FREY HM, 1979, J CHEM SOC A, P1916 GANZER GA, 1986, J AM CHEM SOC, V108, P1517 GRILLER D, 1982, J AM CHEM SOC, V104, P5549 LAL D, 1974, J AM CHEM SOC, V96, P6355 LIU MTH, 1972, INT J CHEM KINET, V4, P229 LIU MTH, 1972, J PHYS CHEM-US, V76, P797 LIU MTH, 1973, CAN J CHEM, V51, P2393 LIU MTH, 1974, J CHEM SOC P2, P937 LIU MTH, 1977, CAN J CHEM, V55, P3596 LIU MTH, 1982, CHEM SOC REV, V11, P127 LIU MTH, 1984, J CHEM SOC CHEM COMM, P1062 LIU MTH, 1984, TETRAHEDRON, V40, P887 LIU MTH, 1985, J CHEM SOC CHEM COMM, P982 LIU MTH, 1986, J CHEM SOC PERK T 2, P211 LIU MTH, 1987, CHEM DIAZIRINES, V1, P111 MANSOOR AM, 1966, TETRAHEDRON LETT, P1753 MANSOOR M, 1967, THESIS U SOUTHAMPTON MOSS RA, 1984, TETRAHEDRON LETT, V25, P1023 NEUVARAND EW, 1967, J PHYS CHEM-US, V71, P1229 SCHMID P, 1979, INT J CHEM KINET, V11, P333 SHERIDAN RS, 1984, J AM CHEM SOC, V106, P436 SKELL PS, 1972, TETRAHEDRON, V28, P3571 SMITH NP, 1979, J CHEM SOC P2, P213 SMITH RAG, 1975, J CHEM SOC P2, P686 VOIGT E, 1975, CHEM BER, V108, P3326; NR: 39; TC: 8; J9: J CHEM SOC PERKIN TRANS 2; PG: 7; GA: DD960Source type: Electronic(1
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