Inorganic Chemistry
1082 NOTES
COKTRIBUTION FROM THE CHEMISTRY DEPARTMEST, Stark receiver. The reaction mixture was concentrated by evapREACTION MOTORS DIVISION, THIOKOL CHEMICAL orating most of the solvent and then dissolved in methanol and precipitated by addition of water. The solid precipitate weighed CORPORATION, DENVILLE, NEW JERSEY 19.5 g. (407, yield); a sample twice recrystallized from hexane Infrared analysis, molecular weight demelted a t 249-251 termination, and elemental analysis indicated the compound to Carborane Derivatives. An Eight-Membered be 1,4-dioxa-6,7-( 1,2-carboranylene)-2-( 1'-carboranyl)-2-methylExocycle of 1,2-Dicarbaclovododecaborane(l2) cyclooctane. T h e infrared spectrum contained absorptions a t 3060 cm.? for CH of carborane, a t 2560 cm.-l for BH of carBY NATHAN MAYESAND JOSEPH GREEN borane, a t 1374 cm.-l for CCH3, a t 1127 cm.-' for COC, and a t 730 for BH deformation of carborane. No absorption for Received February 15, 1965 OH was present. The molecular weight obtained cryoscopically in benzene was 378 (calculated 386). Anal. Calcd. for CgHSo02The syntheses of five- and seven-membered carBto: C, 27.96; H, 7.82; B, 55.93. Found: C,26.77; H, 7.92; borane' exocycles, in which one carborane participates B, 55.72. T h e methanol-water mother liquor was evaporated t o yield a in the ring, have been We wish to report gum from which unreacted 1,2-bis(hydroxymethyl)carborane now such an exocycle which has eight members. This was extracted with 57, aqueous sodium hydroxide and unreacted compound, 1,4-dioxa-6,7-(lj2-carborany1ene)-2-(1'-car1-(epoxyisopropeny1)carborane was extracted with petroleum boranyl)-2-methylcyclooctane, is a condensation prodether. T h e remaining solid, weight 9.6 g. (19% yield), was uct of 1-(epoxyisopropyl)carborane4 and 1,2-bisidentified as P-hydroxy-P-( carboran-1-y1)proppl-( 1 '-hydroxymethylcarboran-2'-yl)1nethyl ether. After three recrystallizations (hydro~ymethy1)carborane.~ The condensation yielded, from heptane it melted a t 196-201". T h e infrared spectrum in addition to the cyclooctane, the linear ether, exhibited absorption bands a t 3370 cm.-l for OH stretching and P-hydroxy-P- (carboran- 1-yl)propyl- (1'- hydroxya doublet a t 1170 and 1160 cm.-l for tertiary OH deformation. methylcarboran-2'-yl)methyl ether. The linear ether Other bands were a t 3080 cm.-l for CH of carborane, a t 2940 is probably an intermediate of the cyclooctane ; howand 2860 cm.-l for aliphatic CH, a t 2560 cm.-' for BH of carborane, a t 1116 cm.-l for COC, and a t 727 an.-' for BH deforever, this was not proven by independently converting mation of carborane. T h e molecular weight determined crythe linear compound to the cyclic compound. oscopically in benzene was 415 (calculated 405). T h e proton The preparation and probable structures of these magnetic resonance spectrum, obtained in benzene solution with compounds are illustrated in the equation below. tetramethylsilane added as an internal reference, exhibited the following singlets ( T ) : 8.95, CH3; 7.18, CHZ; 6.89, tertiary OH; CH? 6.72, CH2; and 6.26, -CBloH&H. The CHzOH group apBFJ / HOCHzC-CCH20H + CHz-C peared as an AB2 multiplet v i t h the center of the CHz doublet \O/ \o/ \ a t T 6.56 and the center of the OH triplet a t T 8.01. The firstC-CH BioHio order coupling constant was 7.9 C.P.S. The error for all values, \O/ except the -CBloHloCH shift, is &0.01 p.p.m. T h e -CBloHioCH BioHio shift error is greater due t o its unusually broad resonance. Anal. Calcd. for CgHsZOsBzo: C, 26.71; H, 7.97; B, 53.44; OH, 8.40. Found: C, 26.95; H 8.09; B, 51.34; OH, 8.92.
".
+
/
\
CHz \ '0
\
CHz
\
o,
CHq-C-C-
CH
Experimental 1-(Epoxyisopropeny1)carborane (26.0 g., 0.130 mole), 1,2bis(hydroxymethy1)carborane (26.0 g., 0.127 mole), and 150 ml. of toluene were placed in a reaction flask fitted with a water condenser, a Dean-Stark distilling receiver, a Teflon-coated magnetic stirrer, and a gas inlet tube. The mixture was heated with stirring t o reflux and became homogeneous. Boron trifluoride was bubbled into the solution several times during 48 hr. of refluxing, and 2.0 ml. of water was collected in the Dean(1) The term "carborane" is used here to denote 1,2-dicarbaclovododecaborane(l2). (2) S. Papetti, B. B. Schaefer, H. J. Troscianiec, and T. L. Heying, Inovg. Chem., 3, 1444 (1964). (3) J. Green, N. Mayes, A. P. Kotkoby, and M. S. Cohen, J . Polymer Sci., A2, 3135 (1964). (4) M. M. Fein, J. Bobinski, N. Mayes, N. Schwartz, and M. S. Cohen, Inovg. Chem., 2, 1111 (1903). ( 5 ) M. M. Fein, D. Grafstein, J. E. Paustian, J. Bobinski, B. M. Lichstein, N. Mayes, N. S. Schwartz, and M. S . Cohen, ibid., 2, 1115 ( 1 9 6 3 ) .
Acknowledgment-We wish to thank Xessrs. Larry Adlum and Raymond Storey for infrared analysis and Dr. David Kates for n.m.r. analysis. This work was supported by the U. S . Air Force, Edwards Air Force Base, under contract AF 33(616)-5639.
CONTRIBUTION FROM IXORGASIC MATERIALS DIVISION, NATIONAL BUREAU OF STASDARDS, WASHINGTON 25, D. C., A N D DEPARTMENT OF CHEMISTRY, UNIPERSITY O F MARYLAXD, COLLEGE PARK, &IARYI,ANn
Additional Observations on t h e Electronic S p e c t r u m of Copper(I1) Acetate M o n o h y d r a t e BY CURTW. R E I M A N NGERALD ,'~ F. KOKOSZKA,'~ AND GILBERT GORDOW'~
Received February 16, 1965
Copper(I1) acetate monohydrate is a binuclear complex.2 At low temperatures it is diamagnetic and (1) (a) National Bureau of Standards; (b) University of Maryland. (2) J. N. van Niekerk and F. R. L. Schoening, Acto Cryst., 6, 227 (1053).
