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Addition of one molecule of hydrogen halide to the triple bond of 1‐alkynyl‐phosphines in aqueous solution is a trans reaction the rate of which is proportional to the activity of the halide ions. Rates of addition of HCl and DCl are approximately equal. The rate determining step involves addition of halide ion to protonated 1‐alkynylphosphine.
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Borkent et al. (1970) studied this question.
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