Koni Posted February 14, 2022 Share Posted February 14, 2022 From Wikipedia : Prototropy is the most common form of tautomerism and refers to the relocation of a hydrogen atom. on these Images you san see the four(4) tautomeric forms of a <TRIPLE-Base> !!!... FIRST !!!... IF you look only at ONE "Base" !!!... You can see the inside Hydrogens to move (Left/Right) from the one Nitrogen-atom to the near Nitrogen-atom !!!... of the same "Base" !!!... and that ist "Prototropy" !!!... SECOND !!!... IF you look now to the three(3) "Bases" !!!... Between two(2) Bases !!!... You have two(2) Hydrogens !!!... which can move !!!... BUT now !!!... they don't need to move (Left/Right) !!!... But they can move (up/down) from the one Base to the other ... the one Hydrogen !!!... and the opposite direction the other Hydrogen !!!... of the second Base !!!... and that is "Double-Prototropy" !!!... The Hydrogens which moves !!!... have to chance places form a "simple-Bond" to a "Hydrogen-Bond" !!!... Link to comment Share on other sites More sharing options...
exchemist Posted February 15, 2022 Share Posted February 15, 2022 (edited) 9 hours ago, Koni said: From Wikipedia : Prototropy is the most common form of tautomerism and refers to the relocation of a hydrogen atom. on these Images you san see the four(4) tautomeric forms of a <TRIPLE-Base> !!!... FIRST !!!... IF you look only at ONE "Base" !!!... You can see the inside Hydrogens to move (Left/Right) from the one Nitrogen-atom to the near Nitrogen-atom !!!... of the same "Base" !!!... and that ist "Prototropy" !!!... SECOND !!!... IF you look now to the three(3) "Bases" !!!... Between two(2) Bases !!!... You have two(2) Hydrogens !!!... which can move !!!... BUT now !!!... they don't need to move (Left/Right) !!!... But they can move (up/down) from the one Base to the other ... the one Hydrogen !!!... and the opposite direction the other Hydrogen !!!... of the second Base !!!... and that is "Double-Prototropy" !!!... The Hydrogens which moves !!!... have to chance places form a "simple-Bond" to a "Hydrogen-Bond" !!!... I may be being a bit thick, but I don't understand these diagrams. Space-filling models are fairly useless at showing bonding and they don't seem to relate to the stick models beneath. Leaving them aside, what is meant by the red and yellow dots in the centres of the hexagons? And how can one tell which atoms are nitrogen? Edited February 15, 2022 by exchemist 1 Link to comment Share on other sites More sharing options...
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