- The nematic discotic phase in materials containing a siloxane core
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The synthesis of a series of novel multipodes based on disc-shaped mesogens with a siloxane core is described. Their phase behaviour is characterised, and compared to the liquid crystalline properties of the discotic molecules without the siloxane moietie
- Kouwer, Paul H. J.,Jager, Walter F.,Mijs, Wim J.,Picken, Stephen J.,Shepperson, Keith J.,Mehl, Georg H.
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p. 377/[1419]-385/[1427]
(2004)
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- One-pot synthesis of 3-hydroxymaleic anhydrides by cyclization of 1,1-bis(trimethylsilyloxy)ketene acetals with oxalyl chloride
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Functionalized 3-hydroxymaleic anhydrides were prepared by cyclization of 1,1-bis(trimethylsilyloxy)ketene acetals with oxalyl chloride.
- Rotzoll, Sven,Ullah, Ehsan,G?rls, Helmar,Fischer, Christine,Langer, Peter
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p. 2647 - 2656
(2007/10/03)
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- Compound having silsesquioxane skeleton and its polymer
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The present invention relates to a compound represented by Formula (1) and a polymer obtained using the compound: wherein R1 is phenyl which may have substituents, Q1 is hydrogen, halogen, alkyl having 1 to 10 carbon atoms, cycloprop
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- Carbon kinetic isotope effects and transition structures in the rearrangements of allyl vinyl ethers. 2-(trimethylsiloxy)- and 2-(methoxycarbonyl)-3-oxa-1,5-hexadiene
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14C KIE (kinetic isotope effects) were measured for the C-1, C-2, C-4, and C-6 positions in the rearrangement of 2-(trimethylsiloxy)- (1a) and 2-(methoxycarbonyl)-3-oxa-1,5-hexadiene (1b). The data, along with earlier C-4 and C-6 deuterium KIE, were fitted to Bebovib modeling calculations. The calculations show that in the transition structure (TS) for 1a 70-80% bond breaking and 20% of bond making occurs, whereas in the TS of 1b both bond breaking and bond making amount to 30-40%. Results for 1a and 1b are compared with earlier results for the parent compound, allyl vinyl ether.
- Kupczyk-Subotkowska, Lidia,Saunders Jr., William H.,Shine, Henry J.,Subotkowski, Witold
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p. 7088 - 7093
(2007/10/02)
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