Mechanisms for interconversions among C3H4 hydrocarbons: deuterium isotope effects and independent generation of vinylmethylene intermediates in photoisomerizations of allenes and cyclopropenes
Mechanisms for interconversions among C3H4 hydrocarbons: deuterium isotope effects and independent generation of vinylmethylene intermediates in photoisomerizations of allenes and cyclopropenes
Reaction of phenyl-substituted allyllithiums with tert-alkyl bromides. Remarkable difference in the alkylation regiochemistry between a polar process and the one involving single-electron transfer
Un chemin reactionnel polaire favorise l'attaque au niveau du site phenyl substitue (C-1) tandis qu'un couplage au niveau de l'autre site (C-3) se produit de facon predominante dans le cas d'un mecanisme SET
Un chemin reactnel polaire favourise l'attaque au niveau du site phenyl substitue (C-1) tandis qu'un couplage au niveau de l'autre site (C-3) se produit de facon predominante dans le cas d'un mecanisme SET
Ozonolysis of a series of 1-substituted indenes. The substituent steric effects on the ozonide exo/endo ratios
作者:Masahiro Miura、Masatomo Nojima、Shigekazu Kusabayashi、Kevin J. McCullough
DOI:10.1021/ja00322a032
日期:1984.5
Ozonolyse d'une serie d'indenes disubstitues (-1,2 et -1,3) et trisubstitues (-1,2,3) dans CCl 4
Ozonolyse d'une serie d'indenes dissubstitues (-1,2 et -1,3) et trisubstitues (-1,2,3) dans CCl 4
The intramolecular reaction of acetophenone <i>N</i>-tosylhydrazone and vinyl: Brønsted acid-promoted cationic cyclization toward polysubstituted indenes
TsNHNH2, a Brønsted acid-promoted intramolecular cyclization of o-(1-arylvinyl) acetophenone derivatives was developed, leading to polysubstituted indenes with complexity and diversity in moderate to excellent yields. In sharp contrast with either the radical or carbene involved cyclization of aldehydic N-tosylhydrazone with vinyl, a cationiccyclization pathway was involved, where N-tosylhydrazone served
Reactions of diphenylcarbene with alkenes, alkynes, and alkenynes
作者:William J. Baron、Michael E. Henrick、Maitland. Jones
DOI:10.1021/ja00800a022
日期:1973.9
Formation of thioruthenium carbonyl clusters via a thioallyl cation complex
作者:Nami Choi、Yoshio Kabe、Wataru Ando
DOI:10.1021/om00038a018
日期:1992.2
Tetramethylallene episulfide (1a) reacts with Ru3(CO)12 to afford the oxidative addition hydride clusters Ru3(CO)10[mu-S(C = CMe2)C(Me2) = CH2](mu-H) (2) and Ru3(CO)9[mu-S(C = CMe2)C(Me = CH2](mu-H) (3), respectively. The structure of 2 was characterized crystallographically. The cluster 2 undergoes decarbonylation at 60-degrees-C to form 3 in 47% yield. The cluster 3 can regenerate 2 by bubbling with carbon monoxide under 1 atm of pressure at room temperature, in 80% yield. The chemical correlations leave little doubt about the structure of 3 which has a six-electron donating (mu-S)(mu-H)-eta(2)-dimethylpentadine ligand. The reaction of 1-tert-butyl-3,3-diphenylallene 1-episulfide (1b) with Ru3(CO)12 resulted in the formation of the cluster Ru3(CO)10[2-(mu-S)-1-tert-butyl-3-phenylindene](mu-H) (5). The X-ray structure of 5 shows that intramolecular cyclization has occurred besides C-S bond cleavage. The thioallyl cation complexes 9 and 10 are the intermediates of the formation of clusters 2 and 5. Upon warming to 80-120-degrees-C, 2 and 5 were finally converted to desulfurized products 2,4-dimethyl-1,3-pentadiene (6) (quantitative) and 1-tert-butyl-3-phenylindene (7) (56%) along with thio cluster HRu5(CO)15[2-(mu-S)-1-tert-butyl-3-phenylindene](mu-4-S) (8) (30%).