Decomposition of α-diazo-ketones: the oxiren–oxocarbene equilibrium
作者:S. A. Matlin、P. G. Sammes
DOI:10.1039/p19720002623
日期:——
A sensitive chemical test for the participation of oxirens in the decomposition of diazo-ketones has been developed, based on the subsequent rearrangement of oxocarbenes to αβ-unsaturated ketones. In this way oxiren participation has been demonstrated in the thermal and photochemicaldecomposition of a variety of diazo-ketones, including 3-diazoheptan-4-one, 1-diazo-3-phenylpropan-2-one, and 2,2-d
addition of nucleophiles to α-methyl-β-methylene carbonyl compounds combined with the hydromagnesiation reactions of 2-alkyl-substituted 1,3-dienes affords a practical, efficient stereo- and regio-controlledaldolsynthesis.
The use of an amidine of formula (I) and/or a conversion product thereof as a catalyst for the crosslinking of a composition based on silane group-containing polymers. The amidine of formula (I) and the conversion products thereof are essentially odourless at room temperature and non-volatile and accelerate the crosslinking of the composition very well without impairing the storage stability of the composition, and are very compatible in the composition. As a result, the compositions do not have a tendency to separate, migrate or evaporate the catalyst.