English to Russian Science Chemistry; Chem Sci/Eng

R3, R4, R5, R6 are each independently hydrogen atom, C1‑C25 alkyl group, C1‑C25 alkoxy group, or C2‑C25 alkenyl group, wherein R3, R4, R5, R6 substituents can be combined together to form substituted or unsubstituted C4‑C10 cyclic or C4‑C12 polycyclic system; can independently also be alkoxy (‑OR'), sulphide (‑SR'), sulfoxide (‑S(O)R'), sulphonium (‑S+R'2), sulphone (‑SO2R'), sulphonamide (‑SO2NR'2), amine (‑NR'2), ammonium (‑N+R'3), nitro (‑NO2), cyano (‑CN), phosphonate (‑P(O)(OR')2), phosphinate (‑P(O)R'(OR')), ***phosphoninum (‑P(OR')2)***, phosphine (‑PR'2), phosphine oxide (‑P(O)R'2), **phosphonium (‑P+R'3)**, carboxy (‑COOH), ester (‑COOR'), amide (‑CONR'2, or ‑NR'C(O)R'), formyl (‑CHO), ketone (‑COR') group, wherein R' is C1‑C5 alkyl, C1‑C5 perfluoroalkyl, C5‑C24 aryl, C7‑C24 aralkyl, C5‑C24 perfluoroaryl;