Übersetzung für "Cyclize" in Deutsch

These cyclize to compounds of the formula (IX).

In this process, zwitterions form as intermediate, which cyclize to give so-called sultones.

Surprisingly, most aldimines of the formula (I) containing HX groups do not tend to cyclize.

Surprisingly, most aldimines of formula (I) containing HX groups do not tend to cyclize.

If the starting compounds of the formula VII contain an electronegative group in the para position to the nitro group, it is recommended to first reduce said o-nitroaniline to the corresponding o-phenylene diamine and thereafter to react and/or cyclize it with the naphthalene-1,4-dicarboxylic acid chloride, as has been described above.

Any conventional strong acid having a dissociation constant (in water, at 25° C.) greater than about 10-4 can be used to cyclize the bis-epoxy-dialkoxy-alkanes to give the aromatics of the formula III.

It is surprising, however, that in the present case the expected acid chlorides of dibenzyl-o-carboxylic acids cyclize immediately to the corresponding dibenzosuberone with the production of hydrogen chloride.

Thus, for example, attempts have been made to cyclize 15-hydroxypentadecanoic acid or 15-halopentadecanoic acid to give cyclopentadecanolide (cf. for example M. H. Klowen and J. G. J. Kok, Parfumerie und Kosmetik 43 (1962), 35;

The copolymers according to the invention cyclize when heated to approximately 400° C. and--under the formation of benzoxazole-, imide-, benzimidazole- and pyrone partial structures--become insoluble in all organic solvents.

Films produced from the copolymer split off water when annealed at approximately 400° C., whereby the o-amino-o'-carboxy-amide groupings cyclize into pyrone structures.

Via tetracarboxylic acid, or the corresponding acid chloride, as an intermediate stage, a copolymer with phenylquinoxaline units and o-carboxyamide groupings (-CO-NH-) is thereby obtained. When annealed to approximately 400° C., they cyclize into imide structures.

However, due to the instability of these free N-substituted o-mercaptophenylurea compounds, it is recommended to cyclize them or their salts directly in the acidic medium by a short-time heating in order to form the intended 2(3H)-benzothiazolone compound substituted in 3-position.

German Offenlegungsschrift No. 1,951,001 describes the preparation of isochromanes by reacting an aromatic hydrocarbon with a lower alkylene oxide in the presence of aluminum chloride in order to prepare an aralkanol/aluminum chloride complex, then partially deactivating the aluminum chloride with a substance containing free hydroxyl groups, and finally adding formaldehyde in order to cyclize the aralkanol to an isochromane.

For example one can add the primary diamines ethylene diamine and propylenediamine to alkanedioldiacrylates and then one can cyclize the obtained reaction products by reaction with aldehydes and ketones.

If the dicarbonyl compounds VB # do not cyclize unaided in the reaction with IVa, the oxadiazolidinediones can be formed by hydrolysis of the ester group in the compounds VIIB # and subsequent treatment with acid.

Conf (1984), pp. 138-141) likewise describe the preparation of open-chain amides of the type N,N'-(1,?-alkylene)bis-4-hydroxybutyramide in the reaction of butyrolactone with diamines; the amides cyclize at elevated temperatures to form alkylenebispyrrolidones.

However, it is also possible to isolate (III), for example so as to subject it to additional purification, and subsequently to cyclize it to (I) in fresh reaction medium.

However, due to the instability of these free o-mercaptophenylurea compounds, it is recommended to cyclize them or their salts directly in the acidic medium by a short-time heating in order to form the intended 2-hydroxybenzothiazole compound.

These are subsequently treated with a “sulfur activator” such as mercury oxide, methyl iodide or ethyl bromoacetate, such that they cyclize directly to give compounds of the formula I type.