2,2-Dihydroxy-methylcyclosiloxanes and other 2,2-difunctional methylcyclosiloxanes

Starting from 2,2-dichloro-methylcyclosiloxanes [–OSiCl2–(OSiMe2)n–] (1a–c) [n: 1, 2, 3] the corresponding 2,2-dihydroxy-methylcyclosiloxanes [–OSi(OH)2–(OSiMe2)n–] (2a–c), the 2,2-dimethoxy-methylcyclosiloxanes [–OSi(OMe)2–(OSiMe2)n–] (3a–c), the 2,2-difluoro-methylcyclosiloxanes [–OSiF2–(OSiMe2)n–] (4a,b) [n: 2, 3], the 2,2-dihydrido-methylcyclosiloxanes [–OSiH2–(OSiMe2)n–] (5a,b) [n: 2, 3] and two spirosiloxanes [–(OSiMe)m–OSi–][–OSi–(OSiMe2)n–] (6a,b) [m,n: a: 3, 1; b: 2, 3] have been synthesized and characterized by NMR-, MS and partly by IR spectroscopy. 2a is stable in diluted solution only. 2b forms a crystalline 1:1 adduct with H2O characterized by X-ray analysis as a highly organized tube like structure.