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• W2045179963 abstract "Dimeric(dimethylamino)(phenylethynyl)borane (2)2 is formed by the reaction of bis(dimethylamino)(phenylethynyl)-borane (1) with 9-BBN-H. An X-ray single-crystal diffraction study revealed a central B2N2 four-membered ring for (2)2 with both alkynyl groups pointing to the same side in a cisoid arrangement. However, solution and solid-state NMR as well as ab initio calculations on model compounds show that the cis arrangement in the crystal chosen for X-ray diffraction is not representative of the bulk material, which consists of both cis and trans isomers. Further investigations of the competition between hydrogen-amino group exchange and hydroboration in the reaction of amino-alkynylboranes with hydroborating agents (9-BBN-H and catB-H) show the exchange to be much faster even in the presence of Wilkinson's catalyst and with cyclic amino-alkynylboranes such as 1,3-dimethyl-2-[(trimethylsily1)ethynyl]-1,3,2-diazaborolidine (3). Ab initio calculations on alkynylboranes I, borirenes II, and boraallenes III, which are all geometrical isomers, show alkynylboranes to be the most stable isomers only if strongly π-donating groups X (X = NH2, F) are attached to the boron atom. In any case, boraallenes are highest in energy." @default.
• W2045179963 created "2016-06-24" @default.
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• W2045179963 date "1995-07-01" @default.
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• W2045179963 title "A Deceiving X‐ray Single‐Crystal Structure Determination: Amino‐Hydrogen Exchange in Amino‐alkynylboranes and ab initio Investigations of Alkynylboranes, Borirenes, and Boraallenes" @default.
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• W2045179963 doi "https://doi.org/10.1002/cber.19951280709" @default.
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