摘要:
A biologically active compound can be solubilized by reaction in different sequences to form a derivative carrying the active moiety, a linking group such as an optionally substituted diisocyanate radical, a polyether moiety such as a polyoxyethylene radical, and a terminal group such as a butyl radical, e.g. ##STR1## n=1 to 400. The active materials can be agricultural chemicals, pharmaceuticals, and the like.
摘要翻译:生物活性化合物可以通过不同序列的反应溶解形成携带活性部分的衍生物,连接基团如任选取代的二异氰酸酯基团,聚醚部分如聚氧乙烯基团,以及端基如丁基 ,例如 + TR n = 1至400.活性物质可以是农药,药物等。
摘要:
The instant invention is directed to a process for the production of low molecular weight polyhydric alcohols by hydrogenating formose solutions in the presence of metal catalysts comprising(a) introducing an at least 20% solution of formose, of which the pH-value was adjusted before hydrogenation to a value of from 7.5 to 12.5, in batches into a first reactor in a manner such that the content of reducible groups, determined as carbonyl groups, in the reactor does not exceed a level of 2% by weight;(b) hydrogenating the solution in batches in the presence of a total quantity of a first catalyst of from 10.sup.-4 to 5.10.sup.-2 % by weight, based on the total quantity of starting product to be reduced, the amount of said first catalyst remaining constant in the reactor, said first catalyst being selected from the group consisting of metals having atomic numbers of from 23 to 29 and mixtures thereof, said metals, being in elemental and/or oxidic form;(c) withdrawing the reaction product in batches from the first reactor after the content of reducible groups, determined as carbonyl groups, has fallen to below 1.5% by weight;(d) adjusting the pH-value of the reaction product to between 3 and 7;(e) introducing said reaction product in batches into a second reactor;(f) hydrogenating said reaction product in batches in the presence of a total quantity of a second catalyst of from 10.sup.-5 to 10.sup.-1 % by weight of active metal, based on the total quantity of starting product to be reduced, the amount of said second catalyst remaining constant in the second reactor, said second catalyst being selected from the group consisting of metals having atomic numbers of 44, 45, 75 and 77, compounds thereof, and mixtures thereof; and(g) after a residence time of from 5 minutes to 4 hours withdrawing the reaction product of the second hydrogenation stage in batches from the second reactor.
摘要:
The instant invention relates to an improved process for the preparation of low molecular weight polyalcohols by the catalytic hydrogenation of a mixture of different low molecular weight hydroxy aldehydes, hydroxy ketones and optionally also polyhydric alcohols such as is formed from the autocondensation of formaldehyde (such a mixture will hereinafter be referred to as "formose"). The invention also relates to the use of these polyalcohols for the production of polyurethane resins.
摘要:
The present invention relates to a process for the preparation of polyisocyanates having biuret groups by reaction of excess quantities of organic polyisocyanates with compounds which react with isocyanate groups to form biuret groups, characterized in that the organic polyisocyanates are reacted with a mixture of water and at least one aliphatic, cycloaliphatic or araliphatic monoamine or polyamine.
摘要:
The present invention relates to a process for the preparation of polyisocyanates having biuret groups by reaction of excess quantities of organic polyisocyanates with compounds which react with isocyanate groups to form biuret groups, characterized in that the organic polyisocyanates are reacted with a mixture of water and at least one aliphatic, cycloaliphatic or araliphatic monoamine or polyamine.
摘要:
The instant invention relates to an improved process for the preparation of low molecular weight polyalcohols by the catalytic hydrogenation of a mixture of different low molecular weight hydroxy aldehydes, hydroxy ketones and optionally also polyhydric alcohols such as is formed from the autocondensation of formaldehyde (such a mixture will hereinafter be referred to as "formose"). The invention also relates to the use of these polyalcohols for the production of polyurethane resins.
摘要:
A process for increasing the duration of action of a pest-combating agent having at least one hydrogen atom which is active in Zerewitinoff reactions but which is not part of a carbamic acid ester group ##STR1## comprising linking the pest-combating agent with a polyether via a difunctional coupling member.
摘要:
This invention relates to an improved process for the preparation of formose by the condensation of aqueous formaldehyde. In the process according to this invention, tertiary amines which contain an electrophilic hetero atom in the .beta.-position to the tertiary nitrogen atom are used for controlling the pH instead of the inorganic bases which have previously been used for this purpose.
摘要:
This invention relates to an improved process for the preparation of formose by the condensation of aqueous formaldehyde. In the process according to this invention, tertiary amines which contain an electrophilic hetero atom in the .beta.-position to the tertiary nitrogen atom are used for controlling the pH instead of the inorganic bases which have previously been used for this purpose.