The physical and NMR characterizations of allyl- and crotylcelluloses

Synthesis of α‐1,3‐ and β‐1,3‐glucan esters with carbon–carbon double bonds and their surface modification

“…This is indicative of the formation of a high molecular weight fraction due to crosslinking and this fraction might be removed during the filtration process; this can be the reason for the weakness and broadness of the β 13 GB chromatogram peak. Crosslinking via C=C groups in cellulose ether derivatives has been proposed in previous research, 27,28 supporting the present results. The quantification of crosslinking was difficult in the present study.…”

“…Allyl cellulose and crotyl cellulose (which are cellulose ethers) with C=C DS values less than 3.0 have been reported. [27][28][29][30][31] However, ether derivatives have low plasticity and are not suitable for plastic materials. Therefore, in the present research, we attempted to introduce C=C structures by esterification to obtain derivatives with high DS values.…”

Using Cross-Metathesis to Couple l-Phenylalanine to a Macrocyclic Lactam

“…Diene 10 was reacted with Grubbs' 2nd generation catalyst 11 under various conditions (Table and Scheme ) to give two 17-membered RCM lactams, 12a and 12b , as geometric isomers . Prior to the addition of catalyst 11 , a few crystals of butylated hydroxyl toluene (BHT) were added to prevent atom transfer radical polymerization (ATRP) …”

Synthesis of new cellulose ethers using Suzuki–Miyaura reactions

“…The first step of this study was the preparation of a halogenated cellulose derivative. Cellulose was thus solubilized in N,N-dimethyl acetamide (DMA)/LiCl in the presence of sodium hydroxide and 1,3dibromopropane was added (Table 1, entry 1) (Sachinvala et al, 2000). Even after 20 h at 70 • C, we could not observe the formation of the desired halogenated cellulose 2a, but the presence of allyl-cellulose, issued from an elimination reaction of a HBr molecule in this basic medium, was detected.…”