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1,2-Dioxyphenylene silicondichloride is formed as a dimer from SiCl 4  and catechol C 6 H 4 (OH) 2  as the first reaction product. The compound melts at 413 K, yielding a viscous liquid which recrystallizes very slowly presumable under the formation of the monomer. 1,2-Dioxyphenylene silicondichloride crystallizes as a dimer in the space group P2 1 /a (No. 14) with a = 1308.5(8) pm, b = 735.8(5) pm, c = 889.6(5) pm, β = 110.02(5)°, Z = 4 formula units. Silicon is tetrahedrally coordinated by two oxygen and two chlorine atoms with the mean bond lengths d̄(Si—O) = 160.7 pm and d̄(Si—Cl) = 200.7 pm. The bond angles at the Si atom range from 104.4 to 112.6° (endocyclic O—Si—O = 110.3°) and the bond angles ∢ (Si—O—C) are 131.4 and 135.9°, respectively. The results are discussed together with data of related compounds.

zeitschrift für naturforschung b

Kristall- und Molekülstruktur des dimeren 1,2-Dioxyphenylen-siliciumdichlorids / Crystal and Molecular Structure of the Dimeric 1,2-Dioxyphenylene Silicondichloride