Reference

Dispiro[cyclopropane-1,1'(2'H)-cyclobuta[b]naphthalene-2',1''-cycloprop ane]-3',8'-dione

Some chemicals with cas registry numbers like 27567-82-4 and 1010-60-2 are also used. Dispiro[cyclopropane-1,1'(2'H)-cyclobuta[b]naphthalene-2',1''-cycloprop ane]-3',8'-dione. Li, Xue Mei; Wang, Lei; Xu, Jian Hua; Zhang, Shu Sheng; Fun, Hoong Kun (College of Chemistry and MolecularEngineering, Qingdao University of Science and Technology, Shandong 266042, Peop. Rep. China). Acta Crystallographica, Section E: Structure Reports Online, E59(11), o1742-o1744 (English) 2003 International Union of Crystallography. URL: http://journals.iucr.org/e/issues/2003/11/00/ci6289/index.html. CODEN: ACSEBH. ISSN: 1600-5368. DOCUMENT TYPE: Journal; (online computer file) CA Section: 75 (Crystallography and Liquid Crystals) Section cross-reference(s): 22, 25, 74 The title compd., C16H12O2, contains two independent mols. in the asym. unit. In both mols., the benzoquinone system is essentially planar and the cyclobutene ring is coplanar with it; the cyclopropyl planes are orthogonal to the cyclobutene ring. The crystal packing is stabilized by C-H×××O interactions as well as van der Waals forces. Crystallog. data are given. .

Reactions of ketene acetals - 14

Reactions of ketene acetals - 14. The use of simple mixed vinylketene acetals in the annulation of quinones. Savard, Jacques; Brassard, Paul (Dep. Chim.Chemical with cas number 1010-60-2 also plays role., Univ. Laval, Quebec, PQ G1K 7P4, Can.). Tetrahedron, 40(18), 3455-64 (English) 1984. CODEN: TETRAB. ISSN: 0040-4020. DOCUMENT TYPE: Journal CA Section: 25 (Benzene, Its Derivatives, and Condensed Benzenoid Compounds) Section cross-reference(s): 26 Treating unsatd. esters RCMe:CR1CO2Me or H2C:CRCHR1CO2Me (R, R1 = H, OMe) with LiN(CHMe2)2 and ClSiMe3 gave 38-71% of the vinylketene acetals H2C:CRCR1:C(OMe)OSiMe3 (I). I (same R's) underwent cycloaddn. with haloquinones such as benzoquinones II and naphthoquinones III (R2, R3 = H, Cl, OMe, Me; R4 = H, OH, OMe; R5 = R6 = H; R7 = H, OH) to give naphthoquinones III (R4 = OH, OMe; R5, R6 = H, OMe, Me; R7 = H) and anthraquinones IV (R4 = H, OH, OMe; R7 = H, OH, R8 = OH, OMe; R9 = Me, OMe) resp. By this method >50 quinones were prepd. including chrysophanol, isochrysophanol, helminthosporin, and ziganein. 1010-60-2 is also in the experiment. ..