|
A silanone in chemistry is the silicon analogue of an ketone. The general description for this class of organic compounds is R1R2Si=O with silicon connected to a terminal oxygen atom via a double bond and also with two organic residues (R).〔 Silanones are extremely reactive 〔 and until 2013 have only been detected by argon matrix isolation 〔〔 or in the gas phase 〔 but not isolated. A synthesis of a stable silanone was reported in 2014. Silanones are of some interest to academic research. Silanones are unstable and favor oligomerisation to a siloxane. The reason for this instability is the weak pi bond with a small HOMO–LUMO energy gap caused by an unfavorable overlap between the p-orbitals of silicon and oxygen. A second reason for the observed instability is the strongly polarized Sið+ - Oð− bond.〔 A stable silanone was reported in 2014.〔 In this compound silicon is bonded to a SIDipp group (1,3-bis(2,6-iPr2-C6H3)imidazolidin-2-ylidene) and a (Cp *)Cr(CO)3 group. Its stability is owed to the direct coordination of silicon to chromium and to steric shielding. The reported Si=O bond length is 1.526 Angstrom and in line with expectation. It has been described as a cationic metallosilanone.〔 ==History== The first to postulate a silanone were Kipping & Lloyd in 1901 〔 but their products were in fact siloxanes. Silanones are of some relevance to the double bond rule. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Silanone」の詳細全文を読む スポンサード リンク
|