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When comparing the conventional technique of homogeneous alkylation to that utilizing a quaternary ammonium salt, similar results are obtained.

A Novel and Chemoselective Process of N-Alkylation of Aromatic Nitrogen Compounds Using Quaternary Ammonium Salts as Starting Material

This can be explained by the fact that introduction of alkyl moiety into protected hydrazine increases nucleophilicity of hydrazine, making the monoalkylated compound prone to undergo a second alkylation. In order to suppress polyalkylation, an at least 3-fold excess of hydrazine was used in further experiments.

Synthesis of aza-phenylalanine, aza-tyrosine, and aza-tryptophan precursors via hydrazine alkylation/ Asa-fenuulalaniini, asa-turosiini ja asa-truptofaani prekursorite suntees hudrasiini alkuulimise teel

Cymene (methylisopropylbenzene) production is commercially carried out by alkylation of toluene with propene.

Alkylation of deactivated aliphatic compounds on zeolites

Cipla apparently does the same phosphate alkylation, but the only patent filing of theirs that I can find that addresses tenofovir production is this one (http://bit.ly/iTvl4u), on its crystalline form.

In the pipeline - process chemistry makes the headlines

Repsol YPF SA (BMAD: REP), a Spain-based oil and gas company, has closed an alkylation unit at its Petronor refinery in Bilbao, Spain on May 23, 2011.

-Repsol YPF SA closes alkylation unit at Petronor refinery

The 1-alkylimidazoles and pyridine compounds have proven to be good precursors for the development of alkylation ILs (Wasserscheid & Welton 2003).

Synthesizing of ionic liquids from different chemical pathways

A number of environmental toxins and chemotherapy drugs are alkylation agents that can attack DNA.

Scientists discover new DNA repair mechanism

Alkylation is an operation in petroleum refining which produces a high value blend for transport fuels, alkylate, with a high octane rating; it contains no aromatic compounds or olefins and is "essentially free of sulphur and other impurities" (Hommeltoft, 2003).

Assessment of cleaner process options: a case study from petroleum refining

The 6in pipe, located at a section of Stanlow known as the HF Alkylation plant, had been neglected for years, Mr Parrington said, adding: "The company failed in its duty to take the necessary measures to avoid a serious accident.

Shell admits blame for release of tonnes of toxic explosive

For example, Lawrence Wein, a professor of management science at the Stanford Business School, has determined that for a conversion cost of $20 million to $30 million per refinery, sulfuric acid could replace hydrofluoric acid in the alkylation process used to manufacture high-octane gasoline.

The next attack: terrorists in Iraq are becoming proficient at blowing up oil refineries. Similar plants in a handful of American cities represent our greatest vulnerability. We could easily be making them less dangerous. But we're not

Of these, 50 use hydrofluoric acid in their alkylation process, which provides high octane while maintaining low sulfur and nitrogen content.

Preventing catastrophic chemical attacks

2005), the proximate cause of mercury alkylation in oral microbial communities--which occurs in dental plaque--appears to be associated with the presence of some bacteria.

Methylmercury, amalgams, and children's health