Tetradecane, preparation

Dibenzyl-14-crown-4 (lithium ionophore VI 6,6-dibenzyl-l,4,8,ll-tetra-oxa-cyclo-tetradecane) [106868-21-7] M 384.5, m 102-103°. Dissolve in CHCI3, wash with saturated aqueous NaCl, dry with MgSOa, evaporate and purify by chromatography on silica gel and gradient elution with C6Hg-MeOH followed by preparative reverse phase HPLC on an octadecyl silanised silica (ODS) column and eluting with MeOH. It can be crystd from MeOH (v Br 120 cm , C-O-C). [7 Chem Soc Perkin Trans 1 1945 1986.]... 

The preparation of the dispiro[5.1.5.1]tetradecane-7,14-dione intermediate is essentially that of Walborsky and Buchman. ... 

Dipolar cycloadditkm reactions of nitrones to olefins, 46, 1,3-Dipolar cycloadditions with 3-phenylsydnone, 45, 98 Dispiro[5 1 5 l]tetradecane-7,14-dione, photolysis to cyclohexylidene-cyclohexane, 47, 34 preparation from cyclohexanecarbonyl chlonde and triethylamine, 47,34 Displacement of bromine from 1-bromo-2-fluoroheptane to give 2-fluoro-heptyl acetate, 46, 37... 

Hesse and coworkers have used this strategy for the preparation of various macrolides.173 For example, Michael addition of 2-nitrocyclodecanone methyl vinyl ketone followed by reduction with (5)-alpine-hydride gives the nitrolactone in 72% yield. Radical denitration of the nitrolactone with Bu3SnH gives (+)-(5)-tetradecan-13-olide in 44% yield (Eq... 

Medium-ring bicyclic diamines have now been prepared and their proton transfer behaviour has been investigated (Alder, 1983). The diamine 1,6-djflza-bicyclo[4.4.4]tetradecane [73] is reluctant to undergo outside-prptonation, presumably because outward pyramidalisation of the nitrogen atoms intro duces strain the diamine exists in the in-in conformation. The strain involved... 

The following applications include the removal of straight-chain from branched-chain or cyclic molecules. For example, type 5A sieves will adsorb n-butyl alcohol but not its branched-chain isomers. Similarly, it separates n-tetradecane from benzene, or n-heptane from methylcyclohexane. A logical development is the use of molecular sieves as chromatographic columns for particular preparations. 

Important for the success in the preparation a proper shell are the ternary phase diagrams of the shell polymer, the core n-tetradecane and the solvent dichloromethane. 

Grant et al. studied a similar system using [Ni(cyclam)]2+ as the catalyst (cyclam = 1,4,8,11-tetra-azacyclo tetradecane), [Ru(bpy)3]2+ as the photosensitizer, and ascorbic acid as the sacrificial reductant [34], and observed a pH dependence on CO/H2 ratios, with the best ratio of 0.83 1 at pH 5. When Kimura etal. prepared pyridine derivatives of [Ni(cyclam)]2+ [35], the best complex, in C02-saturated ascorbate buffer at pH 5.1 and [Ru(bpy)3]2+ as the photosensitizer, produced 5.8-fold more CO than [Ni(cyclam)]2+. 

Several bicyclic hydrazinium ions have been prepared and two synthetic strategies have emerged as generally useful, i.e., electrochemical oxidation and Lewis or Brpnsted acid-promoted cyclization.93 Oxidation of l,6-diazabicyclo[4.4.4]tetradecane, for example, (194) gives the intermediate radical cation (195) and the bicylic dication (196, eq 50).93a... 

Eaton and his co-workers found it possible to prepare the tetracyclo[6.6.0.02,6. O10,14]tetradecanes 494 and 495 through implementation of the double annulation sequence illustrated in Scheme 72.46, 60, 41S Twofold addition of the 3-lithiopropyl... 

Preparation of Samples for Phase Diagrams. Stock solutions of appropriate concentrations of the A-B-A block copolymer In tetradecane and butan-l-ol were made up. All sanq>les were prepared by weight In glass, screw capped vials and In all cases mixing was carried out using a laboratory "Whlrllmlxer". The order of mixing the components was as follows, surfactant In tetradecane, tetradecane, butan-l-ol and finally water. All samples were sealed and kept at 23°C for one month to reach equilibrium. The samples were then studied, as described below, mixed resealed and kept at 47°C for a further month. The samples were then studied and then the procedure... 

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