4436-49-1

Upstream product

• 1112-39-6 dimethyldimethoxysilan 
• 84521-25-5 (1R,7S)-9-Methyl-9-trimethylsilanyl-4,8-dioxa-9-sila-tricyclo[5.2.2.0^2,6]undec-10-ene-3,5-dione 
• 6843-66-9 dimethoxy(diphenyl)silane 
• 84521-19-7 (1R,7S)-9,9-Dimethyl-4,8-dioxa-9-sila-tricyclo[5.2.2.0^2,6]undec-10-ene-3,5-dione 
• 84521-19-7 3,3-dimethyl-2-oxa-3-sila-bicyclo[2.2.2]oct-7-ene-5exo,6exo-dicarboxylic acid anhydride 

Downstream Products

• 92897-93-3 4,9-Dihydroxy-2-phenyl-benzo[f]isoindole-1,3-dione 
• 16859-59-9 3-hydroxy-1(3H)-isobenzofuranone 

Relevant academic research and scientific papers

Direct spectroscopic study of unstable molecules with silicon-oxygen multiple bonds: Low temperature matrix stabilization of (CH3)2Si=O and (CD3)2Si=O in the gas phase

To continue the IR spectroscopic investigations of intermediates with doublebonded silicon, the silanones (CH3)2Si=O and (CD3)2Si=O have been generated by vacuum pyrolysis of the corresponding 6-oxa-3-silabicyclohexanes and of Diels-Alder adducts of silapyranes with maleic anhydride.The above silanones have first been stabilized from the gas phase in argon matrices at 12 K and studied by IR spectroscopy.Using the dependence of the spectra on temperature and pressure in the pyrolysis zone or in warming-up experiments (to 35-40 K) the following vibrational bands of silanones have been revealed: (CH3)2Si=O 1244, 1240, 1210, 822, 798, 770, 657 cm-1; (CD3)2Si=O 1215, 1032, 1007, 995, 712, 685, 674 cm-1.The limits of thermal ( 850 deg C) and kinetic (5 x 10E-4 torr) stability of dimethylsilanone were determined.By comparison of frequencies found with computed values the band 1210 cm-1 in (CH3)2Si=O (1215 cm-1 in (CD3)2Si=O) was assigned to a Si=O streching vibration.This frequency as well as the calculated force constant (8.32 mdyn/Angstroem) and order (1.45) of the Si=O bond are considered as evidence of significant double bonding in dimethylsilanone.

Direct Thermal and Photochemical Generation of Silanones

2-Silapyrans (1,2-oxasilins) are synthesized by the pyrolysis of 1-disilanyl-4-methoxy-1,3-butadienes via initial 1,5-silyl migration to afford an intermediate 1-sila-1,3-butadiene.Diels-Alder reaction of the silapyrans and perfluoro-2-butyne does not lead to isolable adducts but rather leads to apparent extrusion of silanone (R2Si=O), which is trapped by a variety of reagents.Reaction of the silapyrans and maleic anhydride provides stable adducts that extrude silanones upon either thermolysis or photolysis.No evidence could not be found for rearrangement of a silylsilanone to a siloxysilylene.