3574-04-7

Upstream product

• 1450-14-2 1,1,1,2,2,2-hexamethyldisilane 
• 75-78-5 dimethylsilicon dichloride 
• 182680-28-0 Dimethyl-prop-2-ynylsulfanyl-silane 

Downstream Products

• 15942-80-0 Dimethyl bis(2-aminoethoxy)silan 
• 17937-66-5 bis(benzoyloxy)dimethylsilane 
• 1591-02-2 dimethyldibutoxysilane 
• 3440-02-6 dimethyl-diphenoxy-silane 
• 1627-98-1 1,1,3,3-tetramethyl-1,3-disiletane 
• 17520-57-9 1,1,3,3,5,5-hexamethyl-2-oxa-1,3,5-trisilacyclohexane 
• 19939-05-0 1,1,3,3,5,5,7,7-octamethyl-2,4,6-trioxa-1,3,5,7-tetrasilacyclooctane 
• 15261-06-0 1,1,3,3,5,5,7,7-octamethyl-2,6-dioxa-1,3,5,7-tetrasilacyclooctane 
• 17945-19-6 1,1,3,3,5,5-hexamethyl-2,4-dioxa-1,3,5-trisilacyclohexane 
• 865-36-1 thioformaldehyde 
• 1111-83-7 dimethyl silathione 
• 77205-52-8 3,3-dimethyl-1-thia-3-silacyclobutane 
• 4112-23-6 1-sila-1,1-dimethylethylene 
• 14629-67-5 benzylthiotrimethylsilane 

Relevant academic research and scientific papers

Synthesis by FVT and characterization of unhindered silanethiones

The retro-ene reaction of allylthio- and propargylthiosilanes led, under flash vacuum thermolysis (FVT) conditions, to unhindered silanethiones, characterized by their derivatives, and also directly by coupling of the FVT with gas-phase spectrometries. Monomeric silicon oxysulfide has been generated similarly. The unsubstituted silanethione was not obtained, but dehydrogenated into silicon monosulfide during FVT.

Dimethylsilanethione - Generation by retro-ene reaction and cycloaddition with ketene

Dimethylsilanethione was cleanly generated, under flash vacuum thermolysis conditions, by retro-ene cleavage of propargylthiodimethylsilane. The cothermolysis of this latter and ketene dimer led in 60% yield to an only [2 + 2] cycloadduct, 2,2-dimethyl-4-methylene-2-sila-3-thiaoxetane, which in turn can be cleaved at higher temperature to give hexamethylcyclotrisiloxane.

METALLA IV-b-PHOSPHOLANNES II-METALLA-2 (OXA-, THIA- ou AZA-)-3 PHOSPHOLANNES

2-sila-, germa- or stanna- 3-(oxa-, thia- or aza-) phospholanes have been synthesized by reactions of dihalometalla-IV-b compounds with dilithiated β-phosphorus alcohols, thiols or amines HYCH2CH2P(H)Ph (Y=O, S, NMe).Germa- and stanna- heterocycles can also be obtained from germyl- or stannyldiamines and the same β-phosphorus alcohols, thiols or amines. 2-sila 3-(oxa- or thia-) phospholanes are of particular interest for their decomposition reaction leading to silanone or silathione and phosphirane.

SILICIUM-VERBINDUNGEN MIT STARKEN INTRAMOLEKULAREN STERISCHEN WECHSELWIRKUNGEN X. NEUE WEGE ZU 1,3,2,4-DITHIADISILETANEN

2,2,4,4-Tetraorganyl-1,3,2,4-dithiadisiletanes containing bulky organyl groups are obtained by copyrolysis of the disilanes R3Si-SiR3 with sulfur or sulfur hexafluoride, or better by reaction of the disilanes R2HSi-SiHR2 (R=CH3, i-C3H7, cyclo-C6H11, t-C4H9) with sulfur.In the case of R=t-C4H9 a considerable amount of the t-butyl groups is isomerized to the less crowded isobutyl groups.Monomeric silathiones R2Si=S are not available by this route.The sulfur insertion reaction into 1,1-di-t-butyl-1-silacyclobutane yields 2,4-di-t-butyl-2,4-dipropyl-1,3,2,4-dithiadisiletane instead of the expected 1,1-di-t-butyl-1-sila-2-thiacyclopentane.The latter compound, however, results from the crown ether catalyzed cyclisation reaction of 3-bromopropyltrichlorosilane with Na2S followed by transalkylation with t-butyllithium.The iodosilanes R3SiI (R=i-C3H7, cyclo-C6H11) react with Na2S to give the corresponding hexaorganyldisilathianes in high yields.