ction : ▁[ CH ] 3 • ( a 4 Σ − ) ▁+ ▁ ▁→ ▁ ▁+ ▁[ HO ] • ▁ ▁M eth yl id y ne ▁can ▁bind ▁to ▁metal ▁atoms ▁as ▁tr ident ate ▁lig and ▁in ▁coord ination ▁complex es . ▁An ▁example ▁is ▁m eth yl id yn et ric ob alt non ac ar b ony l ▁. ▁ ▁Occ urrence ▁and ▁react ivity ▁ ▁Fischer – T ro ps ch ▁intermediate ▁ ▁M eth yl id y ne - like ▁species ▁are ▁imp lied ▁inter medi ates ▁in ▁the ▁Fischer – T ro ps ch ▁process , ▁the ▁hydro gen ation ▁of ▁CO ▁to ▁produce ▁hydro car b ons . ▁ ▁M eth yl id y ne ▁entities ▁are ▁assumed ▁to ▁bond ▁to ▁the ▁catal yst ' s ▁surface . ▁ ▁A ▁hypoth et ical ▁sequence ▁is : ▁M n CO ▁ ▁+ ▁▁ ▁H 2 ▁ ▁→ ▁ ▁M n CO H ▁M n CO H ▁ ▁+ ▁ ▁H 2 ▁ ▁→ ▁ ▁M n CH ▁ ▁+ ▁ ▁H 2 O ▁M n CH ▁ ▁+ ▁▁ ▁H 2 ▁ ▁→ ▁ ▁M n CH 2 ▁The ▁M n CH ▁intermediate ▁has ▁a ▁tr ident ate ▁m eth yl id ine ▁lig and . ▁ ▁The ▁m eth yl ene ▁lig and ▁( H 2 C ) ▁is ▁then ▁po ised ▁couple ▁to ▁CO ▁or ▁to ▁another ▁m eth yl ene , ▁thereby ▁growing ▁the ▁C – C ▁chain . ▁ ▁Am