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Страница 61.

The rapid acid and slow alkaline hydrolysis observed are however characteristic of an alkali-metal borohydride; this would not react readily with trimethylamine and would not decompose easily when heated. If the apparent KH2N, B2H6 does contain the borohydride KBH4, then the other constituent is probably polymerised aminoborine, H2N,BH2, and this also would not react with trimethylamine and would slowly yield hydrogen on being heated. The difficulty of completely replacing the methyl groups could then be explained if these were present in the polymeric aminoborine; their presence in the borohydride anion is much less probable. Potassium borohydride is soluble in liquid ammonia without reaction; aminoborine is slowly ammonolysed. The solid KH2N,B2He in liquid ammonia only evolved hydrogen very slowly even above 33°, but addition of ammonium chloride produced rapid evolution at low temperature.
§ 85. Место в предложении наречий, характеризующих научные и технические процессы, типа: mechanically, electrically, electrolytically, botani-cally, conductometrically, colorimetrically, potentiometrically, ехот thermally, thermodynamically, azeotropically, gravimetrically, ste-reochemically, fractionally, structurally, quantitatively, qualitatively.
Подобные наречия очень часто встречаются в научной и технической литературе и, как правило, стоят после того глагола, который они характеризуют. Например:
The technique consisted of making up mole-fractions by weight, sealing in Pyrex tubes, and rotating mechanically in a thermostat. The temperature was controlled electrically to + 0,05°.
Today over 90 per cent of all tin plate is produced electrolytically. The authors wish to acknowledge the kindness of Mr. B. J. Rendle for examining the timbers botanically. The stepwise replacement of aquo-by amine-groups can be followed by titrating sulphitotriaquo-palladium (II) with ammonia, both conductometrically and potentiometrically. The compound dissolves exothermally in water to give a brown solution and a small precipitate of hydrated osmium dioxide. The criterion adopted is related thermodynamically to the Barclay-Butler equation between heats and entropies of vaporisation. Benzene was added and the water was removed azeotropically. Iodine was determined gravimetrically as silver iodide. It was considered that this would stereochemically be unfavourable for proton-loss, and would therefore allow this process to occur predominantly in the methyl groups. The acid-insoluble SPNC was fractionally crystallised to give 712 g. of tetramer (m. 122°), 515 g. of a mixed
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polymer fraction (69% of trimer, 20% of tetramer), 808 g. of a mixture of oil and crystals, and a light yellow oil.
§ 86. Место наречий , относящихся к про д-ложениюв целом, типа: fortunately, regrettably, unfortunately, undoubtedly, surprisingly (enough), obviously; originally, subsequently, eventually, finally; mathematically, physically, politically, scientifically, industrially; qualitatively, quantitatively.
Подобные наречия обычно характеризуют все предложение и являются вводными словами. Большей частью эти наречия ставятся в начале предложения.
Например:
Fortunately the methanol solvate of the ester (VII) could be converted into the solvent-free compound without loss of crystal-limly. Regrettably there have been no new world shaft-sinking records established during Congress, though indications are that at least one attempt will be made later this year. Unfortunately, the structure of Meinhard's compound is open to doubt. Undoubtedly, the syrupy triketal fraction was a mixture of various isomeric forms. Surprisingly, perhaps, chromatographically homogeneous 1,3-0-benzylideneglycerol showed absorption at 3633 and 3593 cm"1. Obviously, the product formed from benzylsodium on prolonged storage is a poor initiator.

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