What is diamagnetic anisotropy? It is the nonuniformity of magnetic field due to pi electrons which may either produce shielding or deshielding effect on surrounding portions. In case of alkenes and aromatic compounds, it shows deshielding effect whereas protons attached to alkyne carbon are shielded resulting in decrease in the chemical shift.

Part1: Principles of NMR spectroscopy :    • NMR spectroscopy in easy way  Part 1  
Part 2 : How NMR works :    • NMR spectroscopy in easy way  Part 2...  
Part3 : NMR spectral interpretation and rules:    • NMR spectroscopy in easy way  Part 3...  
Part4 : NMR spectral table:    • NMR spectroscopy in easy way  Part 4...  
Part5 : Magnetic anisotropy:    • NMR spectroscopy in easy way  Part 5...  
Part6: Solvents in NMR :    • NMR spectroscopy in easy way  Part6...  
Part7: 1H vs 13C NMR :    • NMR spectroscopy in easy way  Part 7...  
Part8: Number of NMR signals:    • NMR spectroscopy in easy way  Part 8...  
Part9: Magnetic equivalence:    • NMR spectroscopy in easy way  Part 9...  
Part10: NMR signals in cyclic compounds:    • NMR spectroscopy in easy way  Part 1...