Hassan Y. Elnagar

The solid dihydrate of N,N-di­methyl-n-tetra­decyl­amine oxide

Crystalline N,N-dimethyl-n-tetradecylamine oxide has been prepared by reaction of liquid N,N-dimethyl-n-tetradecylamine with 70% H(2)O(2) in the presence of CO(2) as catalyst. The resulting soft low-melting solid was crystallized as the dihydrate, viz. C(16)H(35)NO.2H(2)O. The extended hydrocarbon chains pack in a parallel fashion, with the N-oxide ends of the molecules forming hydrogen bonds with the water molecules in hydrophilic layers. The N-O distance is 1.411 (3) A.

Ethyl 2-(2,3,4,5,6-Penta-bromo-phen-yl)acetate.

The title compound PBPEA, C10H7Br5O2, has its ethyl acetate portion nearly orthogonal to the benzene ring, with a C—C—C—C torsion angle of 88.3 (5)°. The packing involves an intermolecular contact with a Br⋯Br distance of 3.491 (1) Å, having C—Br⋯Br angles of 173.4 (2) and 106.0 (2)°. The crystal studied was an inversion twin.

2,5-Bis(1,1,3,3-tetra­methyl­butyl)thio­phene

There are two independent molecules in the asymmetric unit of the title compound, C20H36S. Crystals are non-merohedrally twinned by twofold rotation about [001]. The bulky octyl groups of each molecule are on the same side of the thiophene plane and are approximately parallel. S—C distances are in the range 1.729 (4)–1.745 (3) Å, and the C—S—C angles are 92.98 (18) and 93.08 (17)°. The CH2 groups of the octyl groups are involved in weak C—H⋯S intramolecular interactions.