Regioselective Platinum Catalyzed β-Hydrosilylation of Allylic Benzene Derivatives with Cyclic Siloxane D4 H

Coupling agents with 2,4,6,8-tetramethylcyclotetrasiloxane core – synthesis and application in styrene–butadiene rubber production

“…12 These compounds are characterized by flexibility, high strength of Si-O bonds, and high reactivity under specified conditions in miscellaneous organic reactions, i.e., hydrolysis, 13 halogenation, 14 dehydrogenative couplings, 15,16 silylative coupling, 17,18 alkylative cleavage, 19 Piers-Rubinsztajn reaction, 20 ring-opening polymerizations, 21,22 and hydrosilylation. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] 8-Membered compounds such as DH 4 , because of the possible modification of peripheral Si-H groups by a hydrosilylation reaction, have opened access to several functional materials. While cyclosiloxanes have been utilized as substrates in the synthesis of dendritic molecules, 40 films 41,42 and coatings, 30,43 sensors, 44,45 liquid crystallines, 46,47 electrolytes, 48 ceramics, 49 and membranes, 50 there are no reports of their use as precursors of silica modifiers or coupling agents.…”

“…The addition reactions of DH 4 to various olefins have been the subject of numerous reports. The most widely described group of products is DR 4 derivatives, which have four identical groups pendent from the cyclosiloxane core and are obtained by hydrosilylation between DH 4 and unsaturated compounds, including non-functional aliphatic olefins, 38,51 perfluoroalkenes, 23 cycloalkenes, 32 alkenylbenzenes, 24,27,39 allyl alcohol derivatives, 28,34 allylamines, 35,37 alkenyl acid esters, 31,33 vinylsilanes, 25,29,36 and alkynes. 26 Hydrosilylation reactions focused on the modification of DH 4 with two different substrates (olefin or alkyne) leading to products with different content of the groups DSP 3 , DS 2 P 2 or DS 3 P are a more challenging task, definitely less frequently described in the scientific journals, and mainly disclosed in the patent literature.…”