Abstract:One of the most important areas of green chemistry is the application of environmentally friendly solvents in catalysis and synthesis. Conventional organic solvents pose a threat to the environment due to the volatility, highly flammability, toxicity and carcinogenic properties they exhibit. The recently emerged room temperature ionic liquids (RTILs) are promising green solvent alternatives to the volatile organic solvents due to their ease of reuse, non-volatility, thermal stability and ability to dissolve a variety of organic and organometallic compounds. This review explores the use of RTILs as green solvent media in olefin metathesis for applications in the oleochemical industry.

The efficacy of [bmim][X] ionic liquids (ILs) (X = PF6−, BF4− and NTf2−) as reaction media for methyl oleate metathesis was compared with that of conventional organic solvents (PhCl, PhMe, DCM and DCE) using the well-defined first and second generation Grubbs precatalysts, RuCl2(PCy3)(L)(=CHPh) (L = PCy3 or H2IMes). Best catalytic performance, with excellent selectivity (>98%) at moderate reaction temperatures, was achieved in [bmim][X] ILs compared to conventional solvents. The effects of anion, reaction temperature, solvent polarity, solvent viscosity, and ligand-anion interaction on the reaction are also addressed.

The self-metathesis of methyl oleate and methyl ricinoleate was carried out in the presence of ruthenium alkylidene catalysts 1–4 in [bmim] and [bdmim][X] type ionic liquids (RTILs) (X = PF6−, BF4− and NTf2−) using the gas chromatographic technique. Best catalytic performance was obtained in [bdmim][X] type ionic liquids when compared with [bmim][X] type ionic liquids. Catalyst recycling studies were also carried out in the room temperature ionic liquids (RTILs) with catalysts 1–4 in order to explore their possible industrial application.

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The term ‘yoga’ refers to a heterogeneous matrix of philosophies and practices that originated in India and developed into a school of thought sometime between 150 and 500 C. E. Reinterpreted and redacted in multiple religious traditions over the course of its two-thousand-year history, yoga’s dynamic and discontinuous textual and performance traditions are far from monolithic. Modern yoga – a predominantly corporeal practice of postures and breathing techniques – developed in India in the 1920s and is not considered to be a direct successor of yoga’s classical or medieval traditions. Rather, modern yoga’s physical reinventions are emblematic of the accretions and innovations that attended India’s colonial and postcolonial relationship to transnational modernities. A reconfiguration of existing indigenous traditions vis-à-vis transnational influences, modern yoga is the embodiment of hybrid discourses including, but not limited to, the international physical culture movement; the growth of scientific and medicalized discourses of the body; Secularism; the doctrine of progress; Esotericism both in the East and the West; and transnational mobility and migrations of diaspora. In this way, modern yoga’s encounter with multiple modernities reshaped its theoretical and corporeal dispositions, forging a performance practice based on the individual accumulation of physical techniques for psychosomatic health, fitness, and personal development.