Synthesis of N,N,N’,N’-tetraalkylbenzidines through oxidative coupling of N,N-dialkylarylamines induced by SbCl5
作者:Paola Vitale、Leonardo Di Nunno、Antonio Scilimati
DOI:10.3998/ark.5550190.0014.304
日期:——
The oxidativecoupling to 4,4'-N,N,N',N'-tetraalkylbenzidines is the main reaction observed during a study on the reactivity of N,N-dialkylanilines with SbCl 5. A possible reaction mechanism is presented and discussed in comparison with the N,N-dialkylanilines oxidativecoupling achieved with other Lewis acids.
EIGHT-ARM POLYETHYLENE GLYCOL DERIVATIVE, PRODUCTION METHOD THEREFOR, AND MODIFIEDBIO-RELATEDSUBSTANCETHEREOF
申请人:XIAMEN SINOPEG BIOTECH CO., LTD
公开号:US20180214561A1
公开(公告)日:2018-08-02
Disclosed are an eight-arm polyethylene glycol (PEG) derivative (formula I), production method therefor and modified bio-related substance thereby. Wherein, one tetravalent group U together with four trivalent groups E
c
form a highly symmetrical octavalent group CORE
0
; L
c
connects the octavalent group to eight PEG chains having polydispersity or monodispersity and having n
1
to n
8
as the degree of polymerization thereof; the terminal of one PEG chain is connected to at least one functional group F (k≥1); said PEG chain and F therebetween can be directly connected (g=0) or be indirectly connected via a linking group L
0
to a terminal end-branching group G (g=1); the latter provides more reactive sites for binding more drug molecules and increases the drug loading. The eight-arm polyethylene glycol derivative has a centrosymmetric or approximately centrosymmetric structure, and leads to more precise control of the molecular weight in large-scale production and much narrower distribution of molecular weight for products. The modified bio-related substance thereby has a more uniform and controllable performance.