Patent ID: 6570031
Filing Date: 2003-05-27
Classification: C07F,C08F,C08G

Abstract:
A dendrimeric compound of general formulaR14âˆ’iMe1[(R4)nX]iâ€ƒâ€ƒ(I), whereinX represents Me2R2R3(Ry)r, R1, R2, R3, Ry are identical or different, can optionally be singly- or multiply-substituted, and represent hydrogen, C5-C20 cycloalkyl, C1-C20 alkyl, C7-C40 aralkyl, C6-C40 aryl, C1-C10 alkoxy, C6-C40 aryloxy, silyloxy or halogen, R4 is a alkylene, alkenylene or alkinylene radical which is optionally interrupted by one or more heteroatoms and is optionally singly- or multiple-substituted, Me1 represents an element of group IVa of the periodic table of the elements (IUPAC nomenclature), Me2 represents an element of group IIIa of the periodic table of the elements (IUPAC nomenclature), i denotes an integer from 2 to 4, n represents an integer from 1 to 20, and r can be 0 or 1, wherein when r=1 the Me2 radical carries a negative formal charge and if there is a negative formal charge on Me2 this is compensated for by a cation, or whereinX represents Me1R5a[(R4)mMe2R2R3 (Ry)r]3âˆ’a, Me1, Me2, R1, R2, R3, R4, Ry, i, n and r have the aforementioned meanings R5 has the same meaning as the R1, R2, R3 and Ry radicals, m is identical to or different from n and represents integers from 1 to 20, and a denotes 0, 1 or 2, or whereinX represents Me1R5a[(R4)mMe1R6b[(R4)pMe2R2R3(Ry)r]3âˆ’b]3âˆ’a, Me1, Me2, R1, R2, R3, R4, Ry, i, n, r, m and a have the aforementioned meanings R6 has the same meaning as the R1, R2, R3, Ry and R5 radicals, b represents 0, 1 or 2, and p represents integers from 1 to 20, â€ƒwherein said which compounds are produced by the reaction of silicon tetrachloride in a Grignard reaction to form tetraallylsilane, which is subsequently reacted several times alternately a) with trichlorosilane in a quantitative reaction in the presence of a catalyst, and subsequently b) with an allyl compound in a Grignard reaction, using a suitable solvent each time, until a dendrimeric skeletal structure comprising outwardly pointing allyl groups is obtained, the outer allyl groups of which c) are converted into derivatives in a hydroboronation reaction with 9-borabicyclo[3,3,1]nonane. wherein the following said compounds are excluded: in which the rectangles represent a mesogenic group, said mesogenic groups comprising:a) a structure of the general formula â€ƒwherein R=C1 to C6-alkyl â€ƒwhich might be bound to the dendrimer via a C3-C6-alkyl-spacer b) a mesogenic substituent of the generic formula â€”(A)â€”Xâ€”(B)â€”R2 â€ƒwherein R2 represents an alkyl, alkoxy or, alkanoyloxy with up to 12 C-atoms in which 1 or 2 not adjacent CH2 groups can be replaced by âˆ’Oâ€” or â€”CH&boxH;CHâ€”, or cyano, nitro, halogen, or trifluoromethyl X represents a carbonyl â€”Câ€”Câ€” single bond, thioester group, methyleneoxy group, methylene thio group or ethylene group one of A/B represents a ring or ring system which is not aromatic or only partially aromatic, the other one being the same or having a homoaromatic or heteroaromatic structure moiety and at least one of A or B being a trans-4â€²-cyclohexylphenyl-system or a trans-4-trans-4â€²-bicyclohexyl-system or 4,4â€²-phenylene which can have up to 3 fluorine substituents; wherein said circle represents the structure G1.