摘要:
A process for the separation and/or purification of oligo- and polyhydroxy compounds by introducing and subsequently eliminating protective groups, wherein oligo- and polyhydroxy compounds are reacted with bis(ethyl-pivaloyloxy)-diboroxane or ethylboroxine, optionally in inert solvents, the resulting O-ethylboranodiyl derivatives of the hydroxy compounds are separated off and the O-ethylboranodiyl protective groups are eliminated by alcoholic compounds, for example methanol or glycol.
摘要:
Trialkyl boranes are reacted with compounds containing protons in the presence of catalytic amounts of carboxylic acid derivatives, especially derivatives of t-alkyl carboxylic acids, thereby highly increasing the rate of protolyses of trialkyl boranes. These reactions may, for example, be utilized for the borylation of H-acidic compounds or for the dehydration of salts.
摘要:
A condensation according to the following equation ##STR1## is carried out in the presence of a dialkyl boryl carbonxylate, e.g. diethyl boryl pivalate. High yields are obtained.