N-Heterocyclic carbenes (NHCs) were demonstrated to be efficient catalysts for the Staudinger
reaction of ketenes with N-tosyl, N-benzyloxycarbonyl, or N-tert-butoxycarbonyl imines. …

The traditional polycarboxylate (PC) superplasticizers are usually negatively charged polymers,
in which the carboxylate functionalities are responsible for their adsorption on cement …

The influences of triethanolamine (TEA) on the portlandite in hardened cement pastes (HCPs)
were systematically investigated. Results show that the addition of TEA in cement pastes …

Chiral N-hetereocyclic carbenes were found to be efficient catalysts for the formal [2+ 2]
cycloaddition reactions of alkyl (aryl) ketenes with 2-oxoaldehydes to afford beta-lactones with …

The chiral N-hetrocyclic carbenes (NHC)-catalyzed formal [4+ 2] cycloaddition of ketones
with enones to give Î-lactones was reported. The results show that reaction at 0ÂC leads to …

China Railway Track System II slab track is widely applied to China high-speed railway. Under
the high temperature conditions, it tends to produce different degrees of arch at the joints …

A technology that produces a gradient polymer distribution in polymer-modified mortar (PMM)
was developed to minimize the polymer addition in PMM without losing the improved …

A series of chiral N‐heterocyclic carbenes (NHCs), derived from L‐pyrogutamic acid, were
found to be efficient catalysts for the asymmetric dimerization of alkylarylketenes to give the …

The compressive mechanical properties of cement asphalt mortars (CAMs) with varied
bitumen-cement ratio (B/C) were studied under different temperatures, in order to reveal the …

A series of chiral bifunctional N-heterocyclic carbene (NHC) precursors with a proximal
hydroxy group were smoothly prepared from l-pyroglutamic acid. Promising enantiomeric …