anti-2,2,3,3,6,6,7,7,10,10,11,11,14,14,15,15-Hexadecamethyl-2,3,6,7,10,11,14,15-octasilapentacyclo[10.4.2.24,9.05,8.013,16]icosa-1(17),4,8,12(18),13(16),19-hexaene
نویسندگان
چکیده
The title compound, C28H52Si8, was synthesized by condensation of two mol-ecules of 1,2,3,4-tetra-kis-(chloro-dimethyl-sil-yl)benzene with lithium. The 3,4-disila-1,2-benzocyclo-butene rings in the centrosymmetric molecule are bridged by 1,1,2,2-tetra-methyl-disilanylene chains with an anti conformation. The benzene rings are deformed by fusion with a 3,4-disilacyclo-butene ring resulting in a slight boat conformation. Two Si-C bonds are bent to reduce the steric repulsion between the methyl groups on the two Si atoms and the methyl groups on another two Si atoms.
منابع مشابه
Ethyl 1,3,10,12-tetraphenyl-19,20-dioxahexacyclo[10.6.1.13,10.02,11.04,9.013,18]icosa-4(9),5,7,13(18),14,16-hexaene-2-carboxylate
The title compound, C(45)H(34)O(4), is the product of a tandem 'pincer' Diels-Alder reaction consisting of two consecutive [4 + 2] cyclo-additions between two 2-benzofuran units and ethyl propiolate. The mol-ecule comprises a fused hexa-cyclic system containing four five-membered rings, which are in the usual envelope conformation, and two six-membered rings. In addition, four phenyl rings are ...
متن کاملAmino acid sequences of Clostridium pasteurianum flavodoxin.
Lys 10 10 8 4 8 7 5 12 9 13 9 Try 4 4 4 1 2 1 6 3 4 3 4 6 His 0 0 0 1 0 3 I 4 1 0 0 Arg 2 2 2 6 3 3 4 4 8 6 2 Asp 18 17 16 20 17 1 3 1 4 22 28 25 21 28 Thr 4 5 8 6 9 6 8 14 16 8 8 Ser 14 8 7 7 8 4 4 11 11 15 12 Glu 19 21 18 17 18 1 6 1 7 25 22 16 23 26 Pro 4 4 5 4 6 3 4 5 7 5 3 Gly 17 14 14 19 14 11 19 25 28 21 19 Ala 14 6 18 18 15 11 15 24 20 15 12 CvS 1 3 2 5 5 3 2 5 2 1 1 Val 15 10 13 10 16 ...
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Joint Implementation Supervisory Committee Tenth meeting Report Annex 3 Annex 3 SCHEDULE OF MEETINGS OF THE JOINT IMPLEMENTATION SUPERVISORY COMMITTEE IN 2008 Mo Tue Wed Thur Fri Sat Sun Mo Tue Wed Thur Fri Sat Sun Mo Tue Wed Thur Fri Sat Sun Mo Tue Wed Thur Fri Sat Sun Mo Tue 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17...
متن کاملMath 53 Notes
1. Overview: 4/1/13 1 2. First-Order Linear Differential Equations: 4/3/13 2 3. Examples of Integrating Factors: 4/5/13 4 4. Separation of Variables: 4/8/13 5 5. Autonomous Equations: 4/10/13 7 6. Exact Equations: 4/12/13 9 7. More Exact Equations: 4/15/13 10 8. Numerical Methods and Existence and Uniqueness: 4/17/13 11 9. Review of Weeks 1 to 3: 4/19/13 12 10. Systems of Differential Equation:...
متن کامل17-(Pyrimidin-2-yl)-8,16-dioxa-17-azatetracyclo[7.7.1.02,7.010,15]heptadeca-2,4,6,10,12,14-hexaene
In the title compound, C(18)H(13)N(3)O(2), the benzene rings form a dihedral angle of 78.49 (9)°. The dihedral angles between the benzene rings and the pyrimidine ring are 76.53 (10) and 27.73 (11)°. The two cis-fused six-membered heterocyclic rings adopt half-chair confirmations. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds, forming chains parallel to the b axis.
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