The title compound, C50H44, 1, was synthesized as a derivative of hepta-zethrene bearing two methyl and two tert-butyl-phenyl substituents, respectively, at the 1,9- and 7,15-positions. The asymmetric unit consists of one half of the mol-ecule, which lies about an inversion centre. Albeit remotely located, the substituents contort the hepta-zethrene plane. The tert-butyl-phenyl substituents sta...

The simple dialkyl oxalates are generally liquids at room temperature except for dimethyl and di-tert-butyl oxalate which melt at 327 and 343 K. The crystal structures of diethyl, di-iso-propyl, di-n-butyl, di-tert-butyl and methyl ethyl oxalates were determined. The liquid esters were crystallized using the cryocrystallization technique. A comparison of the intermolecular interactions and pack...

The simultaneous etherification of isobutene and isoamylenes with ethanol has been studied using macroreticular acid ion-exchange resins as catalyst. Most of the experiments were carried out over Amberlyst-35. In addition, Amberlyst-15 and Purolite CT-275 were also tested. Chemical equilibrium of four chemical reactions was studied: ethyl tert-butyl ether formation, tert-amyl ethyl ether format...

The present work is to analyse one Ayurvedic formulation, Rasnadichurnam by GC MS know the types of molecules in it. medicine was procured from a standard vendor at Chennai, India and subjected Gas Cnromatography Mass Spectroscopic analysis after processing it as per protocol. indicated profile, such Methyl 4,7,10,13-hexadecatetraenoate, Asarone, Ar-tumerone, Tumerone, trans-2,4-Dimethylthiane,...

The asymmetric unit of the title complex, [Ni(C(12)H(8)N(2))(3)][NiCl(3)(C(7)H(12)N(2)S)](2)·2CH(3)CN, consists of one anion, one-half of a cation and one acetonitrile mol-ecule. The Ni(II) atom in the [Ni(phen)(3)](2+) cation (phen is 1,10-phenanthroline) lies on an inversion centre in an octa-hedral environment, whereas in the [NiCl(3)(tm)](-) anion [tm is 1-tert-butyl-imidazole-2(3H)-thione]...

A series of new cationic dioxidomolybdenum(VI) complexes [MoO2(Ln)]PF6 (2–5) with the tripodal tetradentate pyridyl aminophenolate ligands HL2-HL5 have been synthesized and characterized. Ligands HL2-HL4 carry substituents in 4-position phenolate ring, viz. Cl, Br NO2, respectively, whereas ligand HL5, N-(2-hydroxy-3,5-di-tert-butylbenzyl)-N,N-bis(2-pyridylmethyl)amine, is a derivative 3,5-di-t...

Using a vibrating tube density meter, the densities and speeds of sound 1,2-dichloroethane, methyl tert-butyl ether, diisopropyl diethyl ether were measured at T = 278.15 to 333.15 K atmospheric pressure. The three binary mixtures (1,2-dichloroethane + ethers) also experimentally determined. Redlich–Kister data treatment partial molar volume applied excess mixtures. To conclude, Prigogine–Flory...

Lithiation of N′-phenethyl-N,N-dimethylurea with three equivalents of tert-butyllithium in anhydrous tetrahydrofuran at –78 °C takes place on the nitrogen and on the side-chain of the CH2 next to the phenyl ring (α-lithiation). The 2-lithio isomer can be obtained via bromine–lithium exchange of N′-2-(2-bromophenyl)ethyl-N,N-dimethylurea using methyllithium followed by tertbutyllithium in tetrah...

Among the few bacteria known to utilize methyl tert-butyl ether (MTBE) as a sole carbon source, Methylibium petroleiphilum PM1 is a well-characterized organism with a sequenced genome; however, knowledge of the genetic regulation of its MTBE degradation pathway is limited. We investigated the role of a putative transcriptional activator gene, mdpC, in the induction of MTBE-degradation genes mdp...

Your recent article panning methyl-tert-butyl ether use (EHP 102:913) was extremely misleading and focused on unpublished, and therefore not critically reviewed data, which is inconsistent with standards of scientific journals. Given the confusion caused by the article, you should provide more accurate information to your readers on why methyl-tert-butyl ether (MTBE) is in gasoline and how it i...