Elements of Unsaturation Alkanes are said to be saturated since they have they maximum number of bonds to hydrogen. An alkene is unsaturated. Any t system or a ring system reduces the maximum number of hydrogens a molecule can have. An element of unsaturation relates to 2 missing hydrogens from the saturated formula(C.H2+2). Consider alkane,alkenes,alkynes and cycles: CH,一CH2一CH CH,一CH=CH propane,C.H propene,C.H saturated one element of unsaturation CH2 CH2-CH2 CH,一C=C一H cyclopropane,C.H propyne,CH one element of unsaturation two elements of unsaturation Ch07 Alkenes:Struct synth (landscape) Page4Ch07 Alkenes; Struct + synth (landscape) Page 4 Elements of Unsaturation Alkanes are said to be saturated since they have they maximum number of bonds to hydrogen. An alkene is unsaturated. Any  system or a ring system reduces the maximum number of hydrogens a molecule can have. An element of unsaturation relates to 2 missing hydrogens from the saturated formula (CnH2n+2). Consider alkane, alkenes, alkynes and cycles: