- PROCESS FOR STRAIGHTENING KERATIN FIBRES WITH A HEATING MEANS AND DENATURING AGENTS
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The invention relates to a process for straightening keratin fibres, comprising: (i) a step in which a straightening composition containing at least two denaturing agents is applied to the keratin fibres, (ii) a step in which the temperature of the keratin fibres is raised, using a heating means, to a temperature of between 110 and 250° C.
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- Chlorination and subsequent cyclization to 1,3,4-oxadiazoles of N1-acyl-N3-cyanoguanidines and rerated compounds
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N1-Acyl-, N1-alkoxycarbonyl-, and N1-(N,N-dialkylcarbamoyl)guanidines bearing electron-withdrawing cyano or sulfonyl group at the N3-position were found to provide corresponding rearranged products, 1,3,4-oxadiazoles, when these guanidines were chlorinated by sodium hypochlorite followed by treating with base. Assignments of obtained compounds were accomplished by means of some reactions such as acid hydrolysis, alkoholysis, and catalytic hydrogenations, and of MS spectra.
- Suyama, Takayuki,Hasegawa, Tadashi,Oda, Motokazu,Tomaru, Masahiko,Ohkoshi, Hiroyuki
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p. 121 - 129
(2007/10/03)
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- An Easy Access to Hydrazinocarbonyl Carbamic Acid Ethyl Esters
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The reaction of carboisocyanatidic acid ethyl ester with hydrazines and 3,5-dioxo-1,2,4-triazolidine is reported. The thermal cyclization of the products to 1-substituted 3,5-dioxo-1,2,4-triazolidines and to [1,2,4]triazolo[1,2-a][1,2,4]triazole-1,3,5,7-tetraone was investigated.
- Faleschini, Gottfried
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p. 327 - 331
(2007/10/03)
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- Hydroxyalkyl- and alkoxyalkyl-triazolidine-3,5-dione compounds and their processes for their preparation
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An hydroxyalkyl- and alkoxyalkyl-triazolidine-3,5-dione is disclosed of the formula STR1 wherein R1 represents an unsubstituted or substituted aliphatic radical, which is straight-chain or branched, with 1-20 C atoms, mono- or poly-cycloaliphatic radical with 5 to 21 C atoms, araliphatic radical with 7 to 17 C atoms or aromatic radical with 6 to 20 C atoms, each radical carrying m of the radicals shown in brackets, and it being possible for the aliphatic radicals to be interrupted by one or more oxygen atoms or tertiary nitrogen atoms and for the cycloaliphatic, araliphatic and aromatic radicals to be interrupted by one or more oxygen atoms, tertiary nitrogen atoms or methylene groups with 1 to 4 C atoms, R2 and R3 independently of one another denote hydrogen or a straight-chain or branched aliphatic radical with 1 to 10 C atoms, R4 represents hydrogen or an aliphatic radical, which is straight-chain or branched, with 1 to 20 C atoms, mono- or poly-cycloaliphatic radical with 5 to 10 C atoms or araliphatic radical with 7 to 17 C atoms and m denotes an integer from 1 to 5, and wherein, in the case where m=1, R1 can also represent the radical STR2 a process for the preparation of such compounds by reaction of a triazolidine-3,5-dione with an aliphatic aldehyde or ketone, optionally simultaneously with or followed by reaction of the resultant hydroxyalkyl triazolidine-3,5-diones with an alcohol.
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- Process for the preparation of 1,2,4-triazolidine-3,5-dione
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A process for the preparation of 1,2,4-triazolidine-3,5-dione, which comprises suspending hydrazodicarbonamide in at least one organic, optionally water-miscible solvent and cyclising it at a temperature in the range of from 150° to 280° C. and at a pressure of from 50 mbar to 5 bar with removal of the ammonia split off from the reaction mixture, and isolating the resulting 1,2,4-triazolidine-3,5-dione after crystallization.
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