X-ray structural investigation of three 4-aryl-substituted [2.2]paracyclophanes

• Autorzy: Jones P.G. , Kuś P.
• Języki publikacji: EN

Abstrakty

EN

The low-temperature crystal structures of 4-methylphenyl[2.2]paracyclophane (1), C23H22, orthorhombic, Pbca, a=12.880(2), b=7.4234(12), c=34.425(6) A, Z=8; 2,6-dimethyl-phenyl[2.2]-paracyclophane (2), C24H24, orthorhombic, P2-12-12-1, a=8,593(3), b=12.550(4), c=15.745(4) A, Z=4, and 2,4,5-trimethylphenyl[2.2]paracyclophane (3), C25H26, monoclinic, P2-1/c, a=13.737(2), b=17.883(2), c=15.230(2) A, beta= 103.423(8)degree, Z=8 (two independent molecules) have been determined. Surprisingly, only small differences from the normal paracyclophane structure were found in the three sterically hindered species; the paracyclophane rings are mutually rotated and twisted by a few degrees, and the torsion angle between paracyvlophane and aryl rings is slightly increased in 2 and 3 compared to 1.

Słowa kluczowe

EN

crystal structure; paracyclophane; sterically hindered aryl paracyclophanes

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 1998
• Tom: Vol. 72, nr 8
• Strony: 1999--2008
• Opis fizyczny: Bibliogr. 10 poz., tab.

Twórcy

autor

Jones P.G.

autor

Kuś P.

• Department of Chemistry Silesian University 9, Szkolna Street 40-006 Katowice Poland