599-64-4Relevant articles and documents
MULTISTEP PROCESS FOR THE PREPARATION OF HEXAMETHYLENE DIISOCYANATE, PENTAMETHYLENE DIISOCYANATE OR TOLUENE DIISOCYANATE
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Page/Page column 11, (2019/04/26)
The present invention relates to a multistep process for the preparation of organic diisocyanates by converting the corresponding diamine precursors, urea and hydroxy compounds into monomeric diurethanes, converting these diurethanes into diurethanes of high boiling hydroxy compounds, and finally cleavage of the latter diurethanes to form the diisocyanates and recover the high boiling hydroxy compounds.
METHOD FOR MANUFACTURING α-METHYLSTYRENATED PHENOL
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Paragraph 0035; 0036; 0078; 0079; 0084, (2017/10/14)
According to an embodiment of the present invention, the present invention provides a method for manufacturing α-methyl styrenated phenol, which comprises the following steps: (a) making phenol react with α-methyl styrene (AMS) under the presence of a first acidic catalyst to obtain a first product; and (b) additionally making 1-5 equivalents of α-methyl styrene for 1 equivalent of phenol react with the first product under the presence of a second acidic catalyst to obtain a second product. The manufactured α-methyl styrenated phenol does not generate environmental damage and is economical.(a) Making phenol react with α-methyl styrene (AMS) under the presence of a first acidic catalyst(AA) Obtaining 30-50 wt% of TMPI, 1-10 wt% DMP, 5-20 wt% of cumyl phenol, 1-10 wt% of AMS trimer, and the remaining phenol(b) Additionally making the α-methyl styrene react with a first product under the presence of a second acidic catalyst(BB) Obtaining 5-50 wt% of TMPI + DMP, 2-20 wt% of cumyl phenol, 1-10 wt% of dicumene, 20-60 wt% of dicumyl phenol, and 0.1-5 wt% of AMS trimerCOPYRIGHT KIPO 2017
Calcium-catalyzed hydroarylation of alkenes at room temperature
Niggemann, Meike,Bisek, Nicola
supporting information; experimental part, p. 11246 - 11249 (2010/11/04)
Calcium-catalyst gaining ground: A variety of electron-poor electron-rich and trisubstituted styrene derivatives were reacted to give the desired diarylalkanes within less than an hour at room temperature in the presence of 2.5 mol % of Ca(NTf2)2/Bu4NPF6 (see scheme). Additionally the highly reactive calcium catalyst was successfully applied for the hydroarylation of dienes and even trisubstituted olefins.