摘要:

AbstractThe following substances were prepared with a view to the accurate determination of their heats of combustion: cyclobutane (from cyclobutanone, originating from the reaction between ketene and diazomethane), cycloheptane, cyclooctane and cyclononane (from the cyclanones, which were made by ringenlargement from cyclohexanone).

ISSN:0165-0513    

DOI:10.1002/recl.19510701202

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractThe product, b.p. 136°, reported in the reaction between methallyl chloride and magnesium, is identified as diisocrotyl (2,5‐dimethyl‐2,4‐hexadiene) resulting from rearrangement of dimethallyl, b.p

ISSN:0165-0513    

DOI:10.1002/recl.19510701203

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractBy addition of mercuric chloride to the reaction‐mixture in the Van Slyke apparatus, practically the theoretical values for the amino‐nitrogen content of glycine and peptides having a terminal glycyl‐rest are obtained. If a considerable amount of lithium bromide is present at the same time, the effect of mercuric chloride is greatly lost. Using potassium iodide in that case the right value is found for glycine, but the values for diglycine and triglycine are 7% and 5% too

ISSN:0165-0513    

DOI:10.1002/recl.19510701204

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractGlycine, methylglycine (sarcosine) and dimethylglycine can be quantitatively separated in starch columns using water‐alcohol2:1(v/v) as eluting agent. If amino acid hydrochlorides are to be separated, the eluting agent must be acidified with HCl.Likewise the partial separation of some peptides has been achieved by applying water‐alcohol

ISSN:0165-0513    

DOI:10.1002/recl.19510701205

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractThe preparation of phenyl pyridyl ketones by the action of 2‐lithiopyridine or 3‐lithiopyridine on benzoic anhydride, ethyl benzoate or benzonitrile is described: di‐pyridyl‐phenyl‐carbinols are produced by the further action of lithiopyridine on the ketones so obtained.The action of 2‐lithiopyridine on 2‐cyanopyridine or ethyl picolinate gives bis‐(pyridyl‐2) ketone; in a similar way bis‐(pyridyl‐3) ketone is prepared and some other di‐pyridyl ketones.By the action of 2‐lithiopyridine on bis‐(pyridyl‐2) ketone there is obtained tris‐(pyridyl‐2)‐carbinol; tris‐(pyridyl‐3)‐carbi

ISSN:0165-0513    

DOI:10.1002/recl.19510701206

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractThe chemisorption of hydrogen on a Ni‐catalyst obtained by coprecipitation from Ni(NO3)2, Na2CO3‐ and Na silicate solutions at 80° C and containing Ni and SiO2in the ratio 3 Ni‐1 SiO2was investigated.In agreement with other investigations it was found that the adsorption consists of a very rapid process followed by a much slower one, the latter increasing in velocity with increasing temperature. The transition between the two is not sharp but gradual. However, some distinction may be made by observing the amounts of hydrogen adsorbed at liquid nitrogen temperatures and very low pressure (type I) and the amounts which can be adsorbed in excess of this quantity (type II).It was found that a more thorough reduction of the catalyst resulted in an increase of the type I adsorption at the cost of type II. Adsorption of oxygen on a well‐reduced catalyst on the contrary decreased the type I and increased the type II adsorption, the change being linear with the amount of oxygen adsorbed. Oxygen adsorption can occur in two different manners. It is assumed that depending on the conditons one adsorption site can be occupied by either an oxygen atom or an oxygen molecule.Heating of a reduced catalyst in an inert atmosphere or under vacuum tends to eliminate the type I adsorption while also the total adsorption diminishes. It is suggested here that a reoxidation of the surface occurs (combined with some sintering). Two causes for this reoxydation are considered:adiffusion of oxygen in the interior of the metal—metaloxide structure to the surfacebliberation of water vapour by the silica carrier followed by the reactionNi + H2O

ISSN:0165-0513    

DOI:10.1002/recl.19510701207

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractThe infrared spectrum of andrographolide shows the presence of a five‐membered unsaturated lactone‐ring and a terminal methylene group in the molecule. On catalytic hydrogenation more than four atoms of hydrogen are taken up. A new diacetyl‐anhydro‐andrographolide is de

ISSN:0165-0513    

DOI:10.1002/recl.19510701208

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractThe Raman spectrum of an equimolecular liquid mixture of one mole of HNO3with one mole of SO3has been determined. From the frequency shifts and the polarization of the Raman lines it is inferred, that the reaction HNO3+ SO3→ NO2+ + HSO4− takes place in a strong, although not in a practically quantitative

ISSN:0165-0513    

DOI:10.1002/recl.19510701209

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractIn this communication a diagram is developed for fixing the number of distillation elements necessary in the fractionating column for various purities of distillate and residue and for various types of binary systems in distilling with total reflux and with central introduction of intermediates, similar to the diagram given in the 5th communication1) but now in a more general manner. An example of the use of the diagram is also given.

ISSN:0165-0513    

DOI:10.1002/recl.19510701210

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY

摘要:

AbstractOn montre dans ce travail que la dialkylation de la phtalylhydrazine au moyen de divers halogénures d'alkyles conduit toujours à des 1‐alkyloxy‐3‐alkyl‐4‐phtalazones. Ces derniers composés, traités par le chlorhydrate de pyridine, sont sélectivement déalkylés en position 1, et conduisent à des 3‐alky

ISSN:0165-0513    

DOI:10.1002/recl.19510701211

出版商:WILEY‐VCH Verlag    

年代:1951

数据来源: WILEY