(14)C-Ethylene was metabolized by etiolated pigweed seedlings (Amaranthus retroflexus L.) in the manner similar to that observed in other plants. The hormone was oxidized to (14)CO(2) and incorporated into (14)C-tissue components. Selected cyclic olefins with differing abilities to block ethylene action were used to determine if ethylene metabolism in pigweed is necessary for ethylene action. 2...

The structure of Ni active sites supported on amorphous silica-alumina supports with different contents Al2O3 loadings in relation to their activities ethylene oligomerization were investigated. Two kinds detected by situ FTIR-CO and H2-TPR experiments, that are Ni2+ cations as grafted weak acidic silanols at ion-exchange positions. these Ni/ASA catalysts found an ascending tendency the loading...

In the past 15 years considerable progress has been made in the field of homogeneous catalyzed epoxidations of unfunctionalized olefins. Epoxidation is an important methodology for preparation of highly functionalized organic compounds; optically active epoxides especially are important intermediates. From many olefins it is now possible to create in only one step optically active epoxides in n...

Linear free energy scaling relationships and volcano plots are common tools used to identify potential heterogeneous catalysts for myriad applications. Despite the striking simplicity and predictive power of volcano plots, they remain unknown in homogeneous catalysis. Here, we construct volcano plots to analyze a prototypical reaction from homogeneous catalysis, the Suzuki cross-coupling of ole...

Formaldehyde (HCHO), generating from hydrogen transfer (HT) of reactant, is significant for autocatalysis initiation and deactivation in methanol-to-olefins (MTO), but hitherto, its evolution throughout the reaction has not been thoroughly revealed. Herein, by established colorimetric analysis method, HCHO MTO dimethyl ether (DME)-to-olefins (DTO) reactions over SAPO-34 was situ quantitatively ...

The oligomerization of biomass-derived light olefins offers a promising potential for the synthesis sustainable jet-fuels, which mostly comprise C10-C18 hydrocarbons. However, selectivity control reaction remains challenge. In this contribution, pentene and hexene mixtures was studied over acidic mesoporous Al–SBA–15 catalyst in continuous operation, impact different process parameters on conve...

abstract: in this study an appropriate computational approach was presented for estimating the boiling temperatures of 41 different types of olefins and their derivatives. based on the guidelines of this approach, several structural indices related to the organic components were applied using graph theory. meanwhile, in addition to evaluating the relation between the boiling temperatures of ole...