Reaction of 1,3-diols with Al(tBu)3 and Ga(tBu)3: aluminium- and gallium-based bifunctional tetradentate ligands

Mild depolymerization of silicone grease using aluminum(III)chloride: high‐yield synthesis and crystal structure of [{ClSiMe2OAlCl2}2], and its controlled hydrolysis on aluminum surfaces

“…No yield was given. 4 ) This also contrasts with the results using AlMe 3 , where protracted reflux or sealed-tube furnace heating regimes were employed.…”

“…The yield of 2 from route a (Scheme 1) was half of this, although higher temperatures, a more homogeneous starting material (Me 2 SiO) 4 , and a longer reaction time were employed. It would appear that the siloxane cleavage reaction may proceed under much less forcing conditions than were hitherto assumed.…”

“…It would appear that the siloxane cleavage reaction may proceed under much less forcing conditions than were hitherto assumed. (A more recently reported reaction of (Me 2 SiO) 4 with AlCl 3 did proceed at room temperature, but a reaction time of 6 days was employed, and the isolated material was the product of incomplete depolymerization, 1. No yield was given.…”

“…In the case of aluminum alkyls, the groups of Barron 1 and Ittel 2 have thoroughly investigated the area, and crystallographically characterized the dimeric siloxide product of full depolymerization, [{Me 3 SiOAlMe 2 } 2 ], 1,2 as well as many other examples and intermediate stages. 3,4 However, in these studies, clean products were most frequently available by ring-opening of small oligomeric cyclosiloxanes, such as (Me 2 SiO) 3 or (Me 2 SiO) 4 . Also, conditions were aggressive: either a 4 day toluene reflux or a 24 h heating of neat regents at 180…”

Crystallographic report: [(η5‐C5H5)Fe(CO)2]2Ga3Cl3(OSiMe2OSiMe2O)2: a diiron complex of a tetracyclic trigallasiloxane

“…The title complex (I) was isolated as a minor product from the recrystallization of (η 5 -C 5 H 5 )Fe(CO) 2 Ga( s Mes)Cl (Bunn NR, Aldridge S, unpublished results; s Mes = 2, 4, 6-t Bu 3 C 6 H 3 ) from toluene solution in the presence of adventitious silicone grease. The structure of the trigallasiloxane core ( Fig.…”