1,721,092 research outputs found
The effect of drying on the composition of volatile organic compounds in Rormarinus officinalis, Laurus nobilis, Salvia officinalis and Thymus serpyllum. A HS-SPME-GC-MS study
No full text
Concepts of stereoselective photochemistry and a case study: the Paternò Buechi reaction
No full textPaternò-Buechi reaction and cycloreversion in the reaction of furan with heterocyclic aldehydes
No full text
The photodimerisation of coumarin
No full textThe photochemical dimerisation of coumarin can be rationalised on the basis of simple ab initio calculations. The direct reaction, that occurs through the first excited singlet state. give the syn head-to-head dimer. This dimer can be obtained if the reaction occurs via a frontier orbitals control and if the reaction is concerted. The sensitised reaction gives the anti head-to-head dimer: this product can be obtained by assuming that the frontier orbitals control of the reaction is able to explain the observed regiochemical behaviour. The stereochemical bahaviour can be explained on the basis of the formation of the most stable biradical intermediate
- …
