One, two, three, four: A copper(I)–phosphine complex catalyzes the diborylation of alkynes and arynes, and the tri‐ or tetraborylation of propargyl ethers (see scheme; pin=pinacolato). In the latter cases, the CO bond(s) as well as the CC bond are borylated in one pot. Furthermore, a diborylation product serves as an intermediate in the efficient synthesis of ortho‐terphenyls with pharmacological activity.

Arynes are found to be facilely inserted into bis(pinacolato)diboron by using a platinum-isocyanide catalyst, affording diverse 1,2-diborylarenes, which can be converted into o-terphenyls via Suzuki-Miyaura coupling reaction.

Anhydrous hydrazine is isolated in a pure state as a stable inclusion complex crystal with hydroquinone or p-methoxyphenol, the X-ray structures of which have been analysed; the solid-state reaction of the hydrazine inclusion complex and esters gives hydrazides which are virtually uncontaminated with acid hydrazine salt byproducts.

Eins, zwei, drei, vier: Ein Kupfer(I)‐Phosphinkomplex katalysiert die Diborylierung von Alkinen und Arinen sowie die Tri‐ oder Tetraborylierung von Propargylethern (siehe Schema; pin=Pinakolato). In den letzteren Fällen werden die C‐O‐Einfach‐ und die C‐C‐Dreifachbindung in einem Schritt boryliert. Ein Diborylierungsprodukt diente außerdem als Intermediat in der effizienten Synthese von pharmakologisch aktiven ortho‐Terphenylen.

Easily accessible copper—phosphine complexes serve as catalyst for the formation of different vic‐diborylalkenes from arynes or alkynes.